Merging upstream version 1.70.0+dfsg1.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

16 files changed, 380 insertions, 120 deletions

diff --git a/vendor/mdbook/.cargo-checksum.json b/vendor/mdbook/.cargo-checksum.json
index bb7445f63..fdec4903a 100644
--- a/vendor/mdbook/.cargo-checksum.json
+++ b/vendor/mdbook/.cargo-checksum.json
@@ -1 +1 @@
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\ No newline at end of file
diff --git a/vendor/mdbook/CHANGELOG.md b/vendor/mdbook/CHANGELOG.md
index fd7093d5f..2318f1250 100644
--- a/vendor/mdbook/CHANGELOG.md
+++ b/vendor/mdbook/CHANGELOG.md
@@ -1,5 +1,46 @@
 # Changelog
 
+## mdBook 0.4.28
+[v0.4.27...v0.4.28](https://github.com/rust-lang/mdBook/compare/v0.4.27...v0.4.28)
+
+### Changed
+- The sidebar is now shown on wide screens when localstorage is disabled.
+  [#2017](https://github.com/rust-lang/mdBook/pull/2017)
+- Preprocessors are now run with `mdbook test`.
+  [#1986](https://github.com/rust-lang/mdBook/pull/1986)
+
+### Fixed
+- Fixed regression in 0.4.26 that prevented the title bar from scrolling properly on smaller screens.
+  [#2039](https://github.com/rust-lang/mdBook/pull/2039)
+
+## mdBook 0.4.27
+[v0.4.26...v0.4.27](https://github.com/rust-lang/mdBook/compare/v0.4.26...v0.4.27)
+
+### Changed
+- Reverted the dependency update to the `toml` crate. This was an unintentional breaking change in 0.4.26.
+  [#2021](https://github.com/rust-lang/mdBook/pull/2021)
+
+## mdBook 0.4.26
+[v0.4.25...v0.4.26](https://github.com/rust-lang/mdBook/compare/v0.4.25...v0.4.26)
+
+**The 0.4.26 release has been yanked due to an unintentional breaking change.**
+
+### Changed
+- Removed custom scrollbars for webkit browsers
+  [#1961](https://github.com/rust-lang/mdBook/pull/1961)
+- Updated some dependencies
+  [#1998](https://github.com/rust-lang/mdBook/pull/1998)
+  [#2009](https://github.com/rust-lang/mdBook/pull/2009)
+  [#2011](https://github.com/rust-lang/mdBook/pull/2011)
+- Fonts are now part of the theme.
+  The `output.html.copy-fonts` option has been deprecated.
+  To define custom fonts, be sure to define `theme/fonts.css`.
+  [#1987](https://github.com/rust-lang/mdBook/pull/1987)
+
+### Fixed
+- Fixed overflow viewport issue with mobile Safari
+  [#1994](https://github.com/rust-lang/mdBook/pull/1994)
+
 ## mdBook 0.4.25
 [e14d381...1ba74a3](https://github.com/rust-lang/mdBook/compare/e14d381...1ba74a3)
 
diff --git a/vendor/mdbook/CONTRIBUTING.md b/vendor/mdbook/CONTRIBUTING.md
index 23f90c7a1..e8f592d6d 100644
--- a/vendor/mdbook/CONTRIBUTING.md
+++ b/vendor/mdbook/CONTRIBUTING.md
@@ -7,13 +7,22 @@ If you have come here to learn how to contribute to mdBook, we have some tips fo
 First of all, don't hesitate to ask questions!
 Use the [issue tracker](https://github.com/rust-lang/mdBook/issues), no question is too simple.
 
+### Issue assignment
+
+**:warning: Important :warning:**
+
+Before working on pull request, please ping us on the corresponding issue.
+The current PR backlog is beyond what we can process at this time.
+Only issues that have an [`E-Help-wanted`](https://github.com/rust-lang/mdBook/labels/E-Help-wanted) or [`Feature accepted`](https://github.com/rust-lang/mdBook/labels/Feature%20accepted) label will likely receive reviews.
+If there isn't already an open issue for what you want to work on, please open one first to see if it is something we would be available to review.
+
 ### Issues to work on
 
-Any issue is up for the grabbing, but if you are starting out, you might be interested in the
+If you are starting out, you might be interested in the
 [E-Easy issues](https://github.com/rust-lang/mdBook/issues?q=is%3Aopen+is%3Aissue+label%3AE-Easy).
 Those are issues that are considered more straightforward for beginners to Rust or the codebase itself.
-These issues can be a good launching pad for more involved issues. Easy tasks for a first time contribution
-include documentation improvements, new tests, examples, updating dependencies, etc.
+These issues can be a good launching pad for more involved issues.
+Easy tasks for a first time contribution include documentation improvements, new tests, examples, updating dependencies, etc.
 
 If you come from a web development background, you might be interested in issues related to web technologies tagged
 [A-JavaScript](https://github.com/rust-lang/mdBook/issues?q=is%3Aopen+is%3Aissue+label%3AA-JavaScript),
@@ -21,16 +30,16 @@ If you come from a web development background, you might be interested in issues
 [A-HTML](https://github.com/rust-lang/mdBook/issues?q=is%3Aopen+is%3Aissue+label%3AA-HTML) or
 [A-Mobile](https://github.com/rust-lang/mdBook/issues?q=is%3Aopen+is%3Aissue+label%3AA-Mobile).
 
-When you decide you want to work on a specific issue, ping us on that issue so that we can assign it to you.
+When you decide you want to work on a specific issue, and it isn't already assigned to someone else, assign the issue to yourself by leaving a comment with the text `@rustbot claim`.
 Again, do not hesitate to ask questions. We will gladly mentor anyone that want to tackle an issue.
 
 Issues on the issue tracker are categorized with the following labels:
 
 - **A**-prefixed labels state which area of the project an issue relates to.
 - **E**-prefixed labels show an estimate of the experience necessary to fix the issue.
-- **M**-prefixed labels are meta-issues used for questions, discussions, or tracking issues
+- **M**-prefixed labels are meta-issues regarding the management of the mdBook project itself
 - **S**-prefixed labels show the status of the issue
-- **T**-prefixed labels show the type of issue
+- **C**-prefixed labels show the category of issue
 
 ### Building mdBook
 
@@ -59,7 +68,7 @@ This will ensure we have good quality source code that is better for us all to m
 [rustfmt](https://github.com/rust-lang/rustfmt) has a lot more information on the project.
 The quick guide is
 
-1. Install it
+1. Install it (`rustfmt` is usually installed by default via [rustup](https://rustup.rs/)):
     ```
     rustup component add rustfmt
     ```
@@ -71,18 +80,15 @@ The quick guide is
    ```
    cargo fmt
    ```
-   When run through `cargo` it will format all bin and lib files in the current crate.
+   When run through `cargo` it will format all bin and lib files in the current package.
 
 For more information, such as running it from your favourite editor, please see the `rustfmt` project. [rustfmt](https://github.com/rust-lang/rustfmt)
 
 
 #### Finding Issues with Clippy
 
-Clippy is a code analyser/linter detecting mistakes, and therefore helps to improve your code.
-Like formatting your code with `rustfmt`, running clippy regularly and before your Pull Request will
-help us maintain awesome code.
-
-The best documentation can be found over at [rust-clippy](https://github.com/rust-lang/rust-clippy)
+[Clippy](https://doc.rust-lang.org/clippy/) is a code analyser/linter detecting mistakes, and therefore helps to improve your code.
+Like formatting your code with `rustfmt`, running clippy regularly and before your Pull Request will help us maintain awesome code.
 
 1. To install
     ```
@@ -93,17 +99,36 @@ The best documentation can be found over at [rust-clippy](https://github.com/rus
     cargo clippy
     ```
 
-Clippy has an ever growing list of checks, that are managed in [lint files](https://rust-lang.github.io/rust-clippy/master/index.html).
+### Change requirements
+
+Please consider the following when making a change:
+
+* Almost all changes that modify the Rust code must be accompanied with a test.
+
+* Almost all features and changes must update the documentation.
+  mdBook has the [mdBook Guide](https://rust-lang.github.io/mdBook/) whose source is at <https://github.com/rust-lang/mdBook/tree/master/guide>.
+
+* Almost all Rust items should be documented with doc comments.
+  See the [Rustdoc Book](https://doc.rust-lang.org/rustdoc/) for more information on writing doc comments.
+
+* Breaking the API can only be done in major SemVer releases.
+  These are done very infrequently, so it is preferred to avoid these when possible.
+  See [SemVer Compatibility](https://doc.rust-lang.org/cargo/reference/semver.html) for more information on what a SemVer breaking change is.
+
+  (Note: At this time, some SemVer breaking changes are inevitable due to the current code structure.
+  An example is adding new fields to the config structures.
+  These are intended to be fixed in the next major release.)
+
+* Similarly, the CLI interface is considered to be stable.
+  Care should be taken to avoid breaking existing workflows.
+
+* Check out the [Rust API Guidelines](https://rust-lang.github.io/api-guidelines/) for guidelines on designing the API.
 
 ### Making a pull-request
 
 When you feel comfortable that your changes could be integrated into mdBook, you can create a pull-request on GitHub.
 One of the core maintainers will then approve the changes or request some changes before it gets merged.
 
-If you want to make your pull-request even better, you might want to run [Clippy](https://github.com/Manishearth/rust-clippy)
-and [rustfmt](https://github.com/rust-lang/rustfmt) on the code first.
-This is not a requirement though and will never block a pull-request from being merged.
-
 That's it, happy contributions! :tada: :tada: :tada:
 
 ## Browser compatibility and testing
diff --git a/vendor/mdbook/Cargo.lock b/vendor/mdbook/Cargo.lock
index 9767a38c4..9b05b697e 100644
--- a/vendor/mdbook/Cargo.lock
+++ b/vendor/mdbook/Cargo.lock
@@ -35,17 +35,17 @@ dependencies = [
 
 [[package]]
 name = "anyhow"
-version = "1.0.66"
+version = "1.0.69"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "216261ddc8289130e551ddcd5ce8a064710c0d064a4d2895c67151c92b5443f6"
+checksum = "224afbd727c3d6e4b90103ece64b8d1b67fbb1973b1046c2281eed3f3803f800"
 
 [[package]]
 name = "assert_cmd"
-version = "2.0.7"
+version = "2.0.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "fa3d466004a8b4cb1bc34044240a2fd29d17607e2e3bd613eb44fd48e8100da3"
+checksum = "9834fcc22e0874394a010230586367d4a3e9f11b560f469262678547e1d2575e"
 dependencies = [
- "bstr 1.0.1",
+ "bstr",
  "doc-comment",
  "predicates",
  "predicates-core",
@@ -97,17 +97,6 @@ dependencies = [
 
 [[package]]
 name = "bstr"
-version = "0.2.17"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ba3569f383e8f1598449f1a423e72e99569137b47740b1da11ef19af3d5c3223"
-dependencies = [
- "lazy_static",
- "memchr",
- "regex-automata",
-]
-
-[[package]]
-name = "bstr"
 version = "1.0.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "fca0852af221f458706eb0725c03e4ed6c46af9ac98e6a689d5e634215d594dd"
@@ -155,11 +144,8 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "16b0a3d9ed01224b22057780a37bb8c5dbfe1be8ba48678e7bf57ec4b385411f"
 dependencies = [
  "iana-time-zone",
- "js-sys",
  "num-integer",
  "num-traits",
- "time",
- "wasm-bindgen",
  "winapi",
 ]
 
@@ -520,7 +506,7 @@ checksum = "c05aeb6a22b8f62540c194aac980f2115af067bfe15a0734d7277a768d396b31"
 dependencies = [
  "cfg-if",
  "libc",
- "wasi 0.11.0+wasi-snapshot-preview1",
+ "wasi",
 ]
 
 [[package]]
@@ -559,9 +545,9 @@ dependencies = [
 
 [[package]]
 name = "handlebars"
-version = "4.3.5"
+version = "4.3.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "433e4ab33f1213cdc25b5fa45c76881240cfe79284cf2b395e8b9e312a30a2fd"
+checksum = "035ef95d03713f2c347a72547b7cd38cbc9af7cd51e6099fb62d586d4a6dee3a"
 dependencies = [
  "log",
  "pest",
@@ -838,12 +824,6 @@ dependencies = [
 ]
 
 [[package]]
-name = "lazy_static"
-version = "1.4.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e2abad23fbc42b3700f2f279844dc832adb2b2eb069b2df918f455c4e18cc646"
-
-[[package]]
 name = "libc"
 version = "0.2.138"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -923,7 +903,7 @@ dependencies = [
 
 [[package]]
 name = "mdbook"
-version = "0.4.25"
+version = "0.4.28"
 dependencies = [
  "ammonia",
  "anyhow",
@@ -989,7 +969,7 @@ checksum = "e5d732bc30207a6423068df043e3d02e0735b155ad7ce1a6f76fe2baa5b158de"
 dependencies = [
  "libc",
  "log",
- "wasi 0.11.0+wasi-snapshot-preview1",
+ "wasi",
  "windows-sys",
 ]
 
@@ -1007,9 +987,9 @@ checksum = "61807f77802ff30975e01f4f071c8ba10c022052f98b3294119f3e615d13e5be"
 
 [[package]]
 name = "notify"
-version = "5.0.0"
+version = "5.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ed2c66da08abae1c024c01d635253e402341b4060a12e99b31c7594063bf490a"
+checksum = "58ea850aa68a06e48fdb069c0ec44d0d64c8dbffa49bf3b6f7f0a901fdea1ba9"
 dependencies = [
  "bitflags",
  "crossbeam-channel",
@@ -1020,7 +1000,7 @@ dependencies = [
  "libc",
  "mio",
  "walkdir",
- "winapi",
+ "windows-sys",
 ]
 
 [[package]]
@@ -1064,17 +1044,17 @@ dependencies = [
 
 [[package]]
 name = "once_cell"
-version = "1.16.0"
+version = "1.17.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "86f0b0d4bf799edbc74508c1e8bf170ff5f41238e5f8225603ca7caaae2b7860"
+checksum = "6f61fba1741ea2b3d6a1e3178721804bb716a68a6aeba1149b5d52e3d464ea66"
 
 [[package]]
 name = "opener"
-version = "0.5.0"
+version = "0.5.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4ea3ebcd72a54701f56345f16785a6d3ac2df7e986d273eb4395c0b01db17952"
+checksum = "293c15678e37254c15bd2f092314abb4e51d7fdde05c2021279c12631b54f005"
 dependencies = [
- "bstr 0.2.17",
+ "bstr",
  "winapi",
 ]
 
@@ -1250,9 +1230,9 @@ checksum = "925383efa346730478fb4838dbe9137d2a47675ad789c546d150a6e1dd4ab31c"
 
 [[package]]
 name = "predicates"
-version = "2.1.4"
+version = "2.1.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f54fc5dc63ed3bbf19494623db4f3af16842c0d975818e469022d09e53f0aa05"
+checksum = "59230a63c37f3e18569bdb90e4a89cbf5bf8b06fea0b84e65ea10cc4df47addd"
 dependencies = [
  "difflib",
  "float-cmp",
@@ -1360,9 +1340,9 @@ dependencies = [
 
 [[package]]
 name = "regex"
-version = "1.7.0"
+version = "1.7.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e076559ef8e241f2ae3479e36f97bd5741c0330689e217ad51ce2c76808b868a"
+checksum = "48aaa5748ba571fb95cd2c85c09f629215d3a6ece942baa100950af03a34f733"
 dependencies = [
  "aho-corasick",
  "memchr",
@@ -1459,24 +1439,24 @@ dependencies = [
 
 [[package]]
 name = "semver"
-version = "1.0.14"
+version = "1.0.16"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e25dfac463d778e353db5be2449d1cce89bd6fd23c9f1ea21310ce6e5a1b29c4"
+checksum = "58bc9567378fc7690d6b2addae4e60ac2eeea07becb2c64b9f218b53865cba2a"
 
 [[package]]
 name = "serde"
-version = "1.0.150"
+version = "1.0.152"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e326c9ec8042f1b5da33252c8a37e9ffbd2c9bef0155215b6e6c80c790e05f91"
+checksum = "bb7d1f0d3021d347a83e556fc4683dea2ea09d87bccdf88ff5c12545d89d5efb"
 dependencies = [
  "serde_derive",
 ]
 
 [[package]]
 name = "serde_derive"
-version = "1.0.150"
+version = "1.0.152"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "42a3df25b0713732468deadad63ab9da1f1fd75a48a15024b50363f128db627e"
+checksum = "af487d118eecd09402d70a5d72551860e788df87b464af30e5ea6a38c75c541e"
 dependencies = [
  "proc-macro2",
  "quote",
@@ -1485,9 +1465,9 @@ dependencies = [
 
 [[package]]
 name = "serde_json"
-version = "1.0.89"
+version = "1.0.93"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "020ff22c755c2ed3f8cf162dbb41a7268d934702f3ed3631656ea597e08fc3db"
+checksum = "cad406b69c91885b5107daf2c29572f6c8cdb3c66826821e286c533490c0bc76"
 dependencies = [
  "itoa",
  "ryu",
@@ -1679,17 +1659,6 @@ dependencies = [
 ]
 
 [[package]]
-name = "time"
-version = "0.1.45"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1b797afad3f312d1c66a56d11d0316f916356d11bd158fbc6ca6389ff6bf805a"
-dependencies = [
- "libc",
- "wasi 0.10.0+wasi-snapshot-preview1",
- "winapi",
-]
-
-[[package]]
 name = "tinyvec"
 version = "1.6.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -1706,9 +1675,9 @@ checksum = "cda74da7e1a664f795bb1f8a87ec406fb89a02522cf6e50620d016add6dbbf5c"
 
 [[package]]
 name = "tokio"
-version = "1.23.0"
+version = "1.25.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "eab6d665857cc6ca78d6e80303a02cea7a7851e85dfbd77cbdc09bd129f1ef46"
+checksum = "c8e00990ebabbe4c14c08aca901caed183ecd5c09562a12c824bb53d3c3fd3af"
 dependencies = [
  "autocfg",
  "bytes",
@@ -1970,12 +1939,6 @@ dependencies = [
 
 [[package]]
 name = "wasi"
-version = "0.10.0+wasi-snapshot-preview1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1a143597ca7c7793eff794def352d41792a93c481eb1042423ff7ff72ba2c31f"
-
-[[package]]
-name = "wasi"
 version = "0.11.0+wasi-snapshot-preview1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "9c8d87e72b64a3b4db28d11ce29237c246188f4f51057d65a7eab63b7987e423"
diff --git a/vendor/mdbook/Cargo.toml b/vendor/mdbook/Cargo.toml
index f89b0844e..35a9f78cf 100644
--- a/vendor/mdbook/Cargo.toml
+++ b/vendor/mdbook/Cargo.toml
@@ -13,7 +13,7 @@
 edition = "2021"
 rust-version = "1.60"
 name = "mdbook"
-version = "0.4.25"
+version = "0.4.28"
 authors = [
     "Mathieu David <mathieudavid@mathieudavid.org>",
     "Michael-F-Bryan <michaelfbryan@gmail.com>",
@@ -49,6 +49,8 @@ version = "1.0.28"
 
 [dependencies.chrono]
 version = "0.4"
+features = ["clock"]
+default-features = false
 
 [dependencies.clap]
 version = "4.0.29"
diff --git a/vendor/mdbook/ci/make-release.sh b/vendor/mdbook/ci/make-release.sh
index 8a62b700b..64ef84b92 100755
--- a/vendor/mdbook/ci/make-release.sh
+++ b/vendor/mdbook/ci/make-release.sh
@@ -17,7 +17,7 @@ then
   export "CARGO_TARGET_$(echo $target | tr a-z- A-Z_)_LINKER"=rust-lld
 fi
 export CARGO_PROFILE_RELEASE_LTO=true
-cargo build --bin mdbook --release --target $target
+cargo build --locked --bin mdbook --release --target $target
 cd target/$target/release
 case $1 in
   ubuntu*)
diff --git a/vendor/mdbook/src/book/init.rs b/vendor/mdbook/src/book/init.rs
index dd3fa8b0d..ebcdd9349 100644
--- a/vendor/mdbook/src/book/init.rs
+++ b/vendor/mdbook/src/book/init.rs
@@ -6,6 +6,7 @@ use super::MDBook;
 use crate::config::Config;
 use crate::errors::*;
 use crate::theme;
+use crate::utils::fs::write_file;
 use log::{debug, error, info, trace};
 
 /// A helper for setting up a new book and its directory structure.
@@ -158,6 +159,19 @@ impl BookBuilder {
         let mut highlight_js = File::create(themedir.join("highlight.js"))?;
         highlight_js.write_all(theme::HIGHLIGHT_JS)?;
 
+        write_file(&themedir.join("fonts"), "fonts.css", theme::fonts::CSS)?;
+        for (file_name, contents) in theme::fonts::LICENSES {
+            write_file(&themedir, file_name, contents)?;
+        }
+        for (file_name, contents) in theme::fonts::OPEN_SANS.iter() {
+            write_file(&themedir, file_name, contents)?;
+        }
+        write_file(
+            &themedir,
+            theme::fonts::SOURCE_CODE_PRO.0,
+            theme::fonts::SOURCE_CODE_PRO.1,
+        )?;
+
         Ok(())
     }
 
diff --git a/vendor/mdbook/src/book/mod.rs b/vendor/mdbook/src/book/mod.rs
index 75bbcc714..33fe93f7f 100644
--- a/vendor/mdbook/src/book/mod.rs
+++ b/vendor/mdbook/src/book/mod.rs
@@ -196,21 +196,26 @@ impl MDBook {
         Ok(())
     }
 
-    /// Run the entire build process for a particular [`Renderer`].
-    pub fn execute_build_process(&self, renderer: &dyn Renderer) -> Result<()> {
-        let mut preprocessed_book = self.book.clone();
+    /// Run preprocessors and return the final book.
+    pub fn preprocess_book(&self, renderer: &dyn Renderer) -> Result<(Book, PreprocessorContext)> {
         let preprocess_ctx = PreprocessorContext::new(
             self.root.clone(),
             self.config.clone(),
             renderer.name().to_string(),
         );
-
+        let mut preprocessed_book = self.book.clone();
         for preprocessor in &self.preprocessors {
             if preprocessor_should_run(&**preprocessor, renderer, &self.config) {
                 debug!("Running the {} preprocessor.", preprocessor.name());
                 preprocessed_book = preprocessor.run(&preprocess_ctx, preprocessed_book)?;
             }
         }
+        Ok((preprocessed_book, preprocess_ctx))
+    }
+
+    /// Run the entire build process for a particular [`Renderer`].
+    pub fn execute_build_process(&self, renderer: &dyn Renderer) -> Result<()> {
+        let (preprocessed_book, preprocess_ctx) = self.preprocess_book(renderer)?;
 
         let name = renderer.name();
         let build_dir = self.build_dir_for(name);
@@ -264,13 +269,25 @@ impl MDBook {
 
         let mut chapter_found = false;
 
-        // FIXME: Is "test" the proper renderer name to use here?
-        let preprocess_context =
-            PreprocessorContext::new(self.root.clone(), self.config.clone(), "test".to_string());
+        struct TestRenderer;
+        impl Renderer for TestRenderer {
+            // FIXME: Is "test" the proper renderer name to use here?
+            fn name(&self) -> &str {
+                "test"
+            }
 
-        let book = LinkPreprocessor::new().run(&preprocess_context, self.book.clone())?;
-        // Index Preprocessor is disabled so that chapter paths continue to point to the
-        // actual markdown files.
+            fn render(&self, _: &RenderContext) -> Result<()> {
+                Ok(())
+            }
+        }
+
+        // Index Preprocessor is disabled so that chapter paths
+        // continue to point to the actual markdown files.
+        self.preprocessors = determine_preprocessors(&self.config)?
+            .into_iter()
+            .filter(|pre| pre.name() != IndexPreprocessor::NAME)
+            .collect();
+        let (book, _) = self.preprocess_book(&TestRenderer)?;
 
         let mut failed = false;
         for item in book.iter() {
diff --git a/vendor/mdbook/src/renderer/html_handlebars/hbs_renderer.rs b/vendor/mdbook/src/renderer/html_handlebars/hbs_renderer.rs
index 1b648dac1..e170e2fcd 100644
--- a/vendor/mdbook/src/renderer/html_handlebars/hbs_renderer.rs
+++ b/vendor/mdbook/src/renderer/html_handlebars/hbs_renderer.rs
@@ -289,6 +289,31 @@ impl HtmlHandlebars {
                 theme::fonts::SOURCE_CODE_PRO.1,
             )?;
         }
+        if let Some(fonts_css) = &theme.fonts_css {
+            if !fonts_css.is_empty() {
+                if html_config.copy_fonts {
+                    warn!(
+                        "output.html.copy_fonts is deprecated.\n\
+                        Set copy_fonts=false and ensure the fonts you want are in \
+                        the `theme/fonts/` directory."
+                    );
+                }
+                write_file(destination, "fonts/fonts.css", &fonts_css)?;
+            }
+        }
+        if !html_config.copy_fonts && theme.fonts_css.is_none() {
+            warn!(
+                "output.html.copy_fonts is deprecated.\n\
+                This book appears to have copy_fonts=false without a fonts.css file.\n\
+                Add an empty `theme/fonts/fonts.css` file to squelch this warning."
+            );
+        }
+        for font_file in &theme.font_files {
+            let contents = fs::read(font_file)?;
+            let filename = font_file.file_name().unwrap();
+            let filename = Path::new("fonts").join(filename);
+            write_file(destination, filename, &contents)?;
+        }
 
         let playground_config = &html_config.playground;
 
@@ -656,7 +681,8 @@ fn make_data(
         data.insert("mathjax_support".to_owned(), json!(true));
     }
 
-    if html_config.copy_fonts {
+    // This `matches!` checks for a non-empty file.
+    if html_config.copy_fonts || matches!(theme.fonts_css.as_deref(), Some([_, ..])) {
         data.insert("copy_fonts".to_owned(), json!(true));
     }
 
diff --git a/vendor/mdbook/src/theme/css/chrome.css b/vendor/mdbook/src/theme/css/chrome.css
index 59eae11fd..29992f7b6 100644
--- a/vendor/mdbook/src/theme/css/chrome.css
+++ b/vendor/mdbook/src/theme/css/chrome.css
@@ -2,12 +2,6 @@
 
 @import 'variables.css';
 
-::-webkit-scrollbar {
-    background: var(--bg);
-}
-::-webkit-scrollbar-thumb {
-    background: var(--scrollbar);
-}
 html {
     scrollbar-color: var(--scrollbar) var(--bg);
 }
@@ -18,6 +12,19 @@ a > .hljs {
     color: var(--links);
 }
 
+/*
+    body-container is necessary because mobile browsers don't seem to like
+    overflow-x on the body tag when there is a <meta name="viewport"> tag.
+*/
+#body-container {
+    /*
+        This is used when the sidebar pushes the body content off the side of
+        the screen on small screens. Without it, dragging on mobile Safari
+        will want to reposition the viewport in a weird way.
+    */
+    overflow-x: clip;
+}
+
 /* Menu Bar */
 
 #menu-bar,
diff --git a/vendor/mdbook/src/theme/index.hbs b/vendor/mdbook/src/theme/index.hbs
index 147eb9af2..6f3948c65 100644
--- a/vendor/mdbook/src/theme/index.hbs
+++ b/vendor/mdbook/src/theme/index.hbs
@@ -54,6 +54,7 @@
         {{/if}}
     </head>
     <body>
+    <div id="body-container">
         <!-- Provide site root to javascript -->
         <script>
             var path_to_root = "{{ path_to_root }}";
@@ -91,10 +92,12 @@
         <!-- Hide / unhide sidebar before it is displayed -->
         <script>
             var html = document.querySelector('html');
-            var sidebar = 'hidden';
+            var sidebar = null;
             if (document.body.clientWidth >= 1080) {
                 try { sidebar = localStorage.getItem('mdbook-sidebar'); } catch(e) { }
                 sidebar = sidebar || 'visible';
+            } else {
+                sidebar = 'hidden';
             }
             html.classList.remove('sidebar-visible');
             html.classList.add("sidebar-" + sidebar);
@@ -309,5 +312,6 @@
         {{/if}}
         {{/if}}
 
+    </div>
     </body>
 </html>
diff --git a/vendor/mdbook/src/theme/mod.rs b/vendor/mdbook/src/theme/mod.rs
index 7af5e2b70..6e6b509d1 100644
--- a/vendor/mdbook/src/theme/mod.rs
+++ b/vendor/mdbook/src/theme/mod.rs
@@ -9,7 +9,7 @@ pub mod searcher;
 
 use std::fs::File;
 use std::io::Read;
-use std::path::Path;
+use std::path::{Path, PathBuf};
 
 use crate::errors::*;
 use log::warn;
@@ -54,6 +54,8 @@ pub struct Theme {
     pub general_css: Vec<u8>,
     pub print_css: Vec<u8>,
     pub variables_css: Vec<u8>,
+    pub fonts_css: Option<Vec<u8>>,
+    pub font_files: Vec<PathBuf>,
     pub favicon_png: Option<Vec<u8>>,
     pub favicon_svg: Option<Vec<u8>>,
     pub js: Vec<u8>,
@@ -104,7 +106,7 @@ impl Theme {
                 ),
             ];
 
-            let load_with_warn = |filename: &Path, dest| {
+            let load_with_warn = |filename: &Path, dest: &mut Vec<u8>| {
                 if !filename.exists() {
                     // Don't warn if the file doesn't exist.
                     return false;
@@ -121,6 +123,29 @@ impl Theme {
                 load_with_warn(&filename, dest);
             }
 
+            let fonts_dir = theme_dir.join("fonts");
+            if fonts_dir.exists() {
+                let mut fonts_css = Vec::new();
+                if load_with_warn(&fonts_dir.join("fonts.css"), &mut fonts_css) {
+                    theme.fonts_css.replace(fonts_css);
+                }
+                if let Ok(entries) = fonts_dir.read_dir() {
+                    theme.font_files = entries
+                        .filter_map(|entry| {
+                            let entry = entry.ok()?;
+                            if entry.file_name() == "fonts.css" {
+                                None
+                            } else if entry.file_type().ok()?.is_dir() {
+                                log::info!("skipping font directory {:?}", entry.path());
+                                None
+                            } else {
+                                Some(entry.path())
+                            }
+                        })
+                        .collect();
+                }
+            }
+
             // If the user overrides one favicon, but not the other, do not
             // copy the default for the other.
             let favicon_png = &mut theme.favicon_png.as_mut().unwrap();
@@ -153,6 +178,8 @@ impl Default for Theme {
             general_css: GENERAL_CSS.to_owned(),
             print_css: PRINT_CSS.to_owned(),
             variables_css: VARIABLES_CSS.to_owned(),
+            fonts_css: None,
+            font_files: Vec::new(),
             favicon_png: Some(FAVICON_PNG.to_owned()),
             favicon_svg: Some(FAVICON_SVG.to_owned()),
             js: JS.to_owned(),
@@ -209,10 +236,10 @@ mod tests {
             "favicon.png",
             "favicon.svg",
             "css/chrome.css",
-            "css/fonts.css",
             "css/general.css",
             "css/print.css",
             "css/variables.css",
+            "fonts/fonts.css",
             "book.js",
             "highlight.js",
             "tomorrow-night.css",
@@ -223,6 +250,7 @@ mod tests {
 
         let temp = TempFileBuilder::new().prefix("mdbook-").tempdir().unwrap();
         fs::create_dir(temp.path().join("css")).unwrap();
+        fs::create_dir(temp.path().join("fonts")).unwrap();
 
         // "touch" all of the special files so we have empty copies
         for file in &files {
@@ -240,6 +268,8 @@ mod tests {
             general_css: Vec::new(),
             print_css: Vec::new(),
             variables_css: Vec::new(),
+            fonts_css: Some(Vec::new()),
+            font_files: Vec::new(),
             favicon_png: Some(Vec::new()),
             favicon_svg: Some(Vec::new()),
             js: Vec::new(),
diff --git a/vendor/mdbook/src/utils/fs.rs b/vendor/mdbook/src/utils/fs.rs
index 0d6f38374..67f7062db 100644
--- a/vendor/mdbook/src/utils/fs.rs
+++ b/vendor/mdbook/src/utils/fs.rs
@@ -38,7 +38,6 @@ pub fn write_file<P: AsRef<Path>>(build_dir: &Path, filename: P, content: &[u8])
 /// Consider [submitting a new issue](https://github.com/rust-lang/mdBook/issues)
 /// or a [pull-request](https://github.com/rust-lang/mdBook/pulls) to improve it.
 pub fn path_to_root<P: Into<PathBuf>>(path: P) -> String {
-    debug!("path_to_root");
     // Remove filename and add "../" for every directory
 
     path.into()
diff --git a/vendor/mdbook/tests/init.rs b/vendor/mdbook/tests/init.rs
index 1c3b962b5..2b6ad507c 100644
--- a/vendor/mdbook/tests/init.rs
+++ b/vendor/mdbook/tests/init.rs
@@ -1,5 +1,6 @@
 use mdbook::config::Config;
 use mdbook::MDBook;
+use pretty_assertions::assert_eq;
 use std::fs;
 use std::fs::File;
 use std::io::prelude::*;
@@ -121,6 +122,20 @@ fn copy_theme() {
         "css/variables.css",
         "favicon.png",
         "favicon.svg",
+        "fonts/OPEN-SANS-LICENSE.txt",
+        "fonts/SOURCE-CODE-PRO-LICENSE.txt",
+        "fonts/fonts.css",
+        "fonts/open-sans-v17-all-charsets-300.woff2",
+        "fonts/open-sans-v17-all-charsets-300italic.woff2",
+        "fonts/open-sans-v17-all-charsets-600.woff2",
+        "fonts/open-sans-v17-all-charsets-600italic.woff2",
+        "fonts/open-sans-v17-all-charsets-700.woff2",
+        "fonts/open-sans-v17-all-charsets-700italic.woff2",
+        "fonts/open-sans-v17-all-charsets-800.woff2",
+        "fonts/open-sans-v17-all-charsets-800italic.woff2",
+        "fonts/open-sans-v17-all-charsets-italic.woff2",
+        "fonts/open-sans-v17-all-charsets-regular.woff2",
+        "fonts/source-code-pro-v11-all-charsets-500.woff2",
         "highlight.css",
         "highlight.js",
         "index.hbs",
diff --git a/vendor/mdbook/tests/rendered_output.rs b/vendor/mdbook/tests/rendered_output.rs
index 9750a35e2..a279c4f8e 100644
--- a/vendor/mdbook/tests/rendered_output.rs
+++ b/vendor/mdbook/tests/rendered_output.rs
@@ -1,6 +1,3 @@
-#[macro_use]
-extern crate pretty_assertions;
-
 mod dummy_book;
 
 use crate::dummy_book::{assert_contains_strings, assert_doesnt_contain_strings, DummyBook};
@@ -10,6 +7,7 @@ use mdbook::config::Config;
 use mdbook::errors::*;
 use mdbook::utils::fs::write_file;
 use mdbook::MDBook;
+use pretty_assertions::assert_eq;
 use select::document::Document;
 use select::predicate::{Class, Name, Predicate};
 use std::collections::HashMap;
@@ -842,3 +840,111 @@ mod search {
         }
     }
 }
+
+#[test]
+fn custom_fonts() {
+    // Tests to ensure custom fonts are copied as expected.
+    let builtin_fonts = [
+        "OPEN-SANS-LICENSE.txt",
+        "SOURCE-CODE-PRO-LICENSE.txt",
+        "fonts.css",
+        "open-sans-v17-all-charsets-300.woff2",
+        "open-sans-v17-all-charsets-300italic.woff2",
+        "open-sans-v17-all-charsets-600.woff2",
+        "open-sans-v17-all-charsets-600italic.woff2",
+        "open-sans-v17-all-charsets-700.woff2",
+        "open-sans-v17-all-charsets-700italic.woff2",
+        "open-sans-v17-all-charsets-800.woff2",
+        "open-sans-v17-all-charsets-800italic.woff2",
+        "open-sans-v17-all-charsets-italic.woff2",
+        "open-sans-v17-all-charsets-regular.woff2",
+        "source-code-pro-v11-all-charsets-500.woff2",
+    ];
+    let actual_files = |path: &Path| -> Vec<String> {
+        let mut actual: Vec<_> = path
+            .read_dir()
+            .unwrap()
+            .map(|entry| entry.unwrap().file_name().into_string().unwrap())
+            .collect();
+        actual.sort();
+        actual
+    };
+    let has_fonts_css = |path: &Path| -> bool {
+        let contents = fs::read_to_string(path.join("book/index.html")).unwrap();
+        contents.contains("fonts/fonts.css")
+    };
+
+    // No theme:
+    let temp = TempFileBuilder::new().prefix("mdbook").tempdir().unwrap();
+    let p = temp.path();
+    MDBook::init(p).build().unwrap();
+    MDBook::load(p).unwrap().build().unwrap();
+    assert_eq!(actual_files(&p.join("book/fonts")), &builtin_fonts);
+    assert!(has_fonts_css(p));
+
+    // Full theme.
+    let temp = TempFileBuilder::new().prefix("mdbook").tempdir().unwrap();
+    let p = temp.path();
+    MDBook::init(p).copy_theme(true).build().unwrap();
+    assert_eq!(actual_files(&p.join("theme/fonts")), &builtin_fonts);
+    MDBook::load(p).unwrap().build().unwrap();
+    assert_eq!(actual_files(&p.join("book/fonts")), &builtin_fonts);
+    assert!(has_fonts_css(p));
+
+    // Mixed with copy_fonts=true
+    // This should generate a deprecation warning.
+    let temp = TempFileBuilder::new().prefix("mdbook").tempdir().unwrap();
+    let p = temp.path();
+    MDBook::init(p).build().unwrap();
+    write_file(&p.join("theme/fonts"), "fonts.css", b"/*custom*/").unwrap();
+    write_file(&p.join("theme/fonts"), "myfont.woff", b"").unwrap();
+    MDBook::load(p).unwrap().build().unwrap();
+    assert!(has_fonts_css(p));
+    let mut expected = Vec::from(builtin_fonts);
+    expected.push("myfont.woff");
+    expected.sort();
+    assert_eq!(actual_files(&p.join("book/fonts")), expected.as_slice());
+
+    // copy-fonts=false, no theme
+    // This should generate a deprecation warning.
+    let temp = TempFileBuilder::new().prefix("mdbook").tempdir().unwrap();
+    let p = temp.path();
+    MDBook::init(p).build().unwrap();
+    let config = Config::from_str("output.html.copy-fonts = false").unwrap();
+    MDBook::load_with_config(p, config)
+        .unwrap()
+        .build()
+        .unwrap();
+    assert!(!has_fonts_css(p));
+    assert!(!p.join("book/fonts").exists());
+
+    // copy-fonts=false with empty fonts.css
+    let temp = TempFileBuilder::new().prefix("mdbook").tempdir().unwrap();
+    let p = temp.path();
+    MDBook::init(p).build().unwrap();
+    write_file(&p.join("theme/fonts"), "fonts.css", b"").unwrap();
+    let config = Config::from_str("output.html.copy-fonts = false").unwrap();
+    MDBook::load_with_config(p, config)
+        .unwrap()
+        .build()
+        .unwrap();
+    assert!(!has_fonts_css(p));
+    assert!(!p.join("book/fonts").exists());
+
+    // copy-fonts=false with fonts theme
+    let temp = TempFileBuilder::new().prefix("mdbook").tempdir().unwrap();
+    let p = temp.path();
+    MDBook::init(p).build().unwrap();
+    write_file(&p.join("theme/fonts"), "fonts.css", b"/*custom*/").unwrap();
+    write_file(&p.join("theme/fonts"), "myfont.woff", b"").unwrap();
+    let config = Config::from_str("output.html.copy-fonts = false").unwrap();
+    MDBook::load_with_config(p, config)
+        .unwrap()
+        .build()
+        .unwrap();
+    assert!(has_fonts_css(p));
+    assert_eq!(
+        actual_files(&p.join("book/fonts")),
+        &["fonts.css", "myfont.woff"]
+    );
+}
diff --git a/vendor/mdbook/triagebot.toml b/vendor/mdbook/triagebot.toml
index e7ecb6b3f..9343d9ced 100644
--- a/vendor/mdbook/triagebot.toml
+++ b/vendor/mdbook/triagebot.toml
@@ -1,12 +1,23 @@
 # This will allow users to self assign, and/or drop assignment
 [assign]
 
+# Allows @rustbot ready, review, author, or blocked
+[shortcut]
 
 [relabel]
 allow-unauthenticated = [
-# For Issue areas
+    # For Issue areas
     "A-*",
-    "E-Help-Wanted",
-    "Bug",
-    "Feature-Request"
-]
\ No newline at end of file
+    # Categories
+    "C-*",
+    # Commands
+    "Command-*",
+    # Status
+    "S-*",
+    "regression",
+    "Breaking Change",
+    "msrv-bump",
+]
+
+[autolabel."S-waiting-on-review"]
+new_pr = true