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+/* This test is based on
+ https://searchfox.org/mozilla-central/rev/e082df56bbfeaff0f388e7da9da401ff414df18f/gfx/layers/apz/test/mochitest/browser_test_select_zoom.js
+*/
+
+// In order for this test to test the original bug we need:
+// 1) At least e10s enabled so that apz is enabled so we can create an
+// nsDisplayAsyncZoom item
+// (the insertion of this item without marking the required frame modified
+// is what causes the bug in the retained display list merging)
+// 2) a root content document, again so that we can create a nsDisplayAsyncZoom
+// item
+// 3) the root content document cannot have a display port to start
+// (if it has a display port then it gets a nsDisplayAsyncZoom, but we need
+// that to be created after the anonymous content we insert into the
+// document)
+// Point 3) requires the root content document to be in the parent process,
+// since if it is in a content process it will get a displayport for being at
+// the root of a process.
+// Creating an in-process root content document I think is not possible in
+// mochitest-plain. mochitest-chrome does not have e10s enabled. So this has to
+// be a mochitest-browser-chrome test.
+
+// Outline of this test:
+// Open a new tab with a pretty simple content file, that is not scrollable
+// Use the anonymous content api to insert into that content doc
+// Send a mouse click over the content doc
+// The click hits fixed pos content.
+// This sets a displayport on the root scroll frame of the content doc.
+// (This is because we call GetAsyncScrollableAncestorFrame in
+// PrepareForSetTargetAPZCNotification
+// https://searchfox.org/mozilla-central/rev/e082df56bbfeaff0f388e7da9da401ff414df18f/gfx/layers/apz/util/APZCCallbackHelper.cpp#624
+// which passes the SCROLLABLE_FIXEDPOS_FINDS_ROOT flag
+// https://searchfox.org/mozilla-central/rev/e082df56bbfeaff0f388e7da9da401ff414df18f/layout/base/nsLayoutUtils.cpp#2884
+// so starting from fixed pos content means we always find the root scroll
+// frame, whereas if we started from non-fixed content we'd walk pass the root
+// scroll frame becase it isn't scrollable.)
+// Then we have to be careful not to do anything that causes a full display
+// list rebuild.
+// And finally we change the color of the fixed element which covers the whole
+// viewport which causes us to do a partial display list update including the
+// anonymous content, which hits the assert we are aiming to test.
+
+add_task(async function () {
+ function getChromeURL(filename) {
+ let chromeURL = getRootDirectory(gTestPath) + filename;
+ return chromeURL;
+ }
+
+ // We need this otherwise there is a burst animation on the new tab when it
+ // loads and that somehow scrolls a scroll frame, which makes it active,
+ // which makes the scrolled frame an AGR, which means we have multiple AGRs
+ // (the display port makes the root scroll frame active and an AGR) so we hit
+ // this
+ // https://searchfox.org/mozilla-central/rev/e082df56bbfeaff0f388e7da9da401ff414df18f/layout/painting/RetainedDisplayListBuilder.cpp#1179
+ // and are forced to do a full display list rebuild and that prevents us from
+ // testing the original bug.
+ await SpecialPowers.pushPrefEnv({
+ set: [["ui.prefersReducedMotion", 1]],
+ });
+
+ const pageUrl = getChromeURL("helper_bug1701027-1.html");
+ let tab = await BrowserTestUtils.openNewForegroundTab(gBrowser, pageUrl);
+
+ const [theX, theY] = await SpecialPowers.spawn(
+ tab.linkedBrowser,
+ [],
+ async () => {
+ content.document.body.offsetWidth;
+
+ await new Promise(r => content.window.requestAnimationFrame(r));
+
+ const rect = content.document
+ .getElementById("fd")
+ .getBoundingClientRect();
+ const x = content.window.mozInnerScreenX + rect.left + rect.width / 2;
+ const y = content.window.mozInnerScreenY + rect.top + rect.height / 2;
+
+ let doc = SpecialPowers.wrap(content.document);
+ var bq = doc.createElement("blockquote");
+ bq.textContent = "This blockquote text.";
+ var div = doc.createElement("div");
+ div.textContent = " This div text.";
+ bq.appendChild(div);
+ var ac = doc.insertAnonymousContent(bq);
+ content.document.body.offsetWidth;
+
+ await new Promise(r => content.window.requestAnimationFrame(r));
+ await new Promise(r => content.window.requestAnimationFrame(r));
+
+ return [x, y];
+ }
+ );
+
+ EventUtils.synthesizeNativeMouseEvent({
+ type: "click",
+ target: window.document.documentElement,
+ screenX: theX,
+ screenY: theY,
+ });
+
+ await new Promise(resolve => setTimeout(resolve, 0));
+ await SpecialPowers.spawn(tab.linkedBrowser, [], async () => {
+ await new Promise(r => content.window.requestAnimationFrame(r));
+ await new Promise(r => content.window.requestAnimationFrame(r));
+ });
+
+ await SpecialPowers.spawn(tab.linkedBrowser, [], async () => {
+ content.document.getElementById("fd").style.backgroundColor = "blue";
+ });
+
+ await new Promise(resolve => setTimeout(resolve, 0));
+ await SpecialPowers.spawn(tab.linkedBrowser, [], async () => {
+ await new Promise(r => content.window.requestAnimationFrame(r));
+ await new Promise(r => content.window.requestAnimationFrame(r));
+ });
+
+ await SpecialPowers.spawn(tab.linkedBrowser, [], async () => {
+ content.document.getElementById("fd").style.backgroundColor = "red";
+ });
+
+ await new Promise(resolve => setTimeout(resolve, 0));
+ await SpecialPowers.spawn(tab.linkedBrowser, [], async () => {
+ await new Promise(r => content.window.requestAnimationFrame(r));
+ await new Promise(r => content.window.requestAnimationFrame(r));
+ });
+
+ BrowserTestUtils.removeTab(tab);
+
+ ok(true, "didn't crash");
+});