1 files changed, 39 insertions, 0 deletions
diff --git a/toolkit/content/tests/browser/browser_charsetMenu_swapBrowsers.js b/toolkit/content/tests/browser/browser_charsetMenu_swapBrowsers.js
new file mode 100644
index 0000000000..9ea8fccf29
--- /dev/null
+++ b/toolkit/content/tests/browser/browser_charsetMenu_swapBrowsers.js
@@ -0,0 +1,39 @@
+/* Test that the charset menu is properly enabled when swapping browsers. */
+add_task(async function test() {
+  function charsetMenuEnabled() {
+    return !document
+      .getElementById("repair-text-encoding")
+      .hasAttribute("disabled");
+  }
+
+  const PAGE =
+    "data:text/html;charset=windows-1252,<!DOCTYPE html><body>hello %e4";
+  let tab1 = await BrowserTestUtils.openNewForegroundTab({
+    gBrowser,
+    url: PAGE,
+  });
+  await BrowserTestUtils.waitForMutationCondition(
+    document.getElementById("repair-text-encoding"),
+    { attributes: true },
+    charsetMenuEnabled
+  );
+  ok(charsetMenuEnabled(), "should have a charset menu here");
+
+  let tab2 = await BrowserTestUtils.openNewForegroundTab({ gBrowser });
+  ok(!charsetMenuEnabled(), "about:blank shouldn't have a charset menu");
+
+  await BrowserTestUtils.switchTab(gBrowser, tab1);
+
+  let swapped = BrowserTestUtils.waitForEvent(
+    tab2.linkedBrowser,
+    "SwapDocShells"
+  );
+
+  // NB: Closes tab1.
+  gBrowser.swapBrowsersAndCloseOther(tab2, tab1);
+  await swapped;
+
+  ok(charsetMenuEnabled(), "should have a charset after the swap");
+
+  BrowserTestUtils.removeTab(tab2);
+});