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+<!DOCTYPE html>
+<html>
+ <!--
+ https://bugzilla.mozilla.org/show_bug.cgi?id=1292781
+ -->
+ <head>
+ <title>Test for bug 1292781</title>
+ <script type="application/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
+ <script type="application/javascript" src="/tests/SimpleTest/EventUtils.js"></script>
+ <script type="application/javascript" src="/tests/SimpleTest/paint_listener.js"></script>
+ <script type="application/javascript" src="apz_test_utils.js"></script>
+ <script type="application/javascript" src="apz_test_native_event_utils.js"></script>
+ <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
+ <style>
+ .outer {
+ height: 400px;
+ width: 415px;
+ overflow: hidden;
+ position: relative;
+ }
+ .inner {
+ height: 100%;
+ outline: none;
+ overflow-x: hidden;
+ overflow-y: scroll;
+ position: relative;
+ }
+ .inner div:nth-child(even) {
+ background-color: lightblue;
+ }
+ .inner div:nth-child(odd) {
+ background-color: lightgreen;
+ }
+ .outer.contentBefore::before {
+ top: 0;
+ content: '';
+ display: block;
+ height: 2px;
+ position: absolute;
+ width: 100%;
+ z-index: 99;
+ }
+ </style>
+ </head>
+ <body>
+<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1292781">Mozilla Bug 1292781</a>
+<p id="display"></p>
+<div id="content">
+ <p>The frame reconstruction should not leave this scrollframe in a bad state</p>
+ <div class="outer">
+ <div class="inner">
+ this is the top of the scrollframe.
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ this is near the top of the scrollframe.
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ this is near the bottom of the scrollframe.
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ <div>this is a box</div>
+ this is the bottom of the scrollframe.
+ </div>
+ </div>
+</div>
+
+<pre id="test">
+<script type="text/javascript">
+
+// Returns a list of async scroll offsets that the |inner| element had, one for
+// each paint.
+function getAsyncScrollOffsets(aPaintsToIgnore) {
+ var offsets = [];
+ var compositorTestData = SpecialPowers.getDOMWindowUtils(window).getCompositorAPZTestData();
+ var buckets = compositorTestData.paints.slice(aPaintsToIgnore);
+ ok(buckets.length >= 3, "Expected at least three paints in the compositor test data");
+ var childIsLayerized = false;
+ for (var i = 0; i < buckets.length; ++i) {
+ var apzcTree = buildApzcTree(convertScrollFrameData(buckets[i].scrollFrames));
+ var rcd = findRcdNode(apzcTree);
+ if (rcd == null) {
+ continue;
+ }
+ if (rcd.children.length > 0) {
+ // The child may not be layerized in the first few paints, but once it is
+ // layerized, it should stay layerized.
+ childIsLayerized = true;
+ }
+ if (!childIsLayerized) {
+ continue;
+ }
+
+ ok(rcd.children.length == 1, "Root content APZC has exactly one child");
+ var scroll = rcd.children[0].asyncScrollOffset;
+ var pieces = scroll.replace(/[()\s]+/g, '').split(',');
+ is(pieces.length, 2, "expected string of form (x,y)");
+ offsets.push({ x: parseInt(pieces[0]),
+ y: parseInt(pieces[1]) });
+ }
+ return offsets;
+}
+
+function* test(testDriver) {
+ var utils = SpecialPowers.DOMWindowUtils;
+
+ // The APZ test data accumulates whenever a test turns it on. We just want
+ // the data for this test, so we check how many frames are already recorded
+ // and discard those later.
+ var framesToSkip = SpecialPowers.getDOMWindowUtils(window).getCompositorAPZTestData().paints.length;
+
+ var elm = document.getElementsByClassName('inner')[0];
+ // Set a zero-margin displayport to ensure that the element is async-scrollable
+ // otherwise on Fennec it is not
+ utils.setDisplayPortMarginsForElement(0, 0, 0, 0, elm, 0);
+
+ var maxScroll = elm.scrollTopMax;
+ elm.scrollTop = maxScroll;
+ yield waitForAllPaints(function() {
+ flushApzRepaints(testDriver);
+ });
+
+ // Take control of the refresh driver
+ utils.advanceTimeAndRefresh(0);
+
+ // Force the next reflow to get interrupted
+ utils.forceReflowInterrupt();
+
+ // Make a change that triggers frame reconstruction, and then tick the refresh
+ // driver so that layout processes the pending restyles and then runs an
+ // interruptible reflow. That reflow *will* be interrupted (because of the flag
+ // we set above), and we should end up with a transient 0,0 scroll offset
+ // being sent to the compositor.
+ elm.parentNode.classList.add('contentBefore');
+ utils.advanceTimeAndRefresh(0);
+ // On android, and maybe non-e10s platforms generally, we need to manually
+ // kick the paint to send the layer transaction to the compositor.
+ yield waitForAllPaints(function() { setTimeout(testDriver, 0) });
+
+ // Read the main-thread scroll offset; although this is temporarily 0,0 that
+ // temporary value is never exposed to content - instead reading this value
+ // will finish doing the interrupted reflow from above and then report the
+ // correct scroll offset.
+ is(elm.scrollTop, maxScroll, "Main-thread scroll position was restored");
+
+ // .. and now flush everything to make sure the state gets pushed over to the
+ // compositor and APZ as well.
+ utils.restoreNormalRefresh();
+ yield waitForApzFlushedRepaints(testDriver);
+
+ // Now we pull the compositor data and check it. What we expect to see is that
+ // the scroll position goes to maxScroll, then drops to 0 and then goes back
+ // to maxScroll. This test is specifically testing that last bit - that it
+ // properly gets restored from 0 to maxScroll.
+ // The one hitch is that on Android this page is loaded with some amount of
+ // zoom, and the async scroll is in ParentLayerPixel coordinates, so it will
+ // not match maxScroll exactly. Since we can't reliably compute what that
+ // ParentLayer scroll will be, we just make sure the async scroll is nonzero
+ // and use the first value we encounter to verify that it got restored properly.
+ // The other alternative is to spawn this test into a new window with 1.0 zoom
+ // but I'm tired of doing that for pretty much every test.
+ var state = 0;
+ var asyncScrollOffsets = getAsyncScrollOffsets(framesToSkip);
+ dump("Got scroll offsets: " + JSON.stringify(asyncScrollOffsets) + "\n");
+ var maxScrollParentLayerPixels = maxScroll;
+ while (asyncScrollOffsets.length > 0) {
+ let offset = asyncScrollOffsets.shift();
+ switch (state) {
+ // 0 is the initial state, the scroll offset might be zero but should
+ // become non-zero from when we set scrollTop to scrollTopMax
+ case 0:
+ if (offset.y == 0) {
+ break;
+ }
+ if (getPlatform() == "android") {
+ ok(offset.y > 0, "Async scroll y of scrollframe is " + offset.y);
+ maxScrollParentLayerPixels = offset.y;
+ } else {
+ is(offset.y, maxScrollParentLayerPixels, "Async scroll y of scrollframe is " + offset.y);
+ }
+ state = 1;
+ break;
+
+ // state 1 starts out at maxScrollParentLayerPixels, should drop to 0
+ // because of the interrupted reflow putting the scroll into a transient
+ // zero state
+ case 1:
+ if (offset.y == maxScrollParentLayerPixels) {
+ break;
+ }
+ is(offset.y, 0, "Async scroll position was temporarily 0");
+ state = 2;
+ break;
+
+ // state 2 starts out the transient 0 scroll offset, and we expect the
+ // scroll position to get restored back to maxScrollParentLayerPixels
+ case 2:
+ if (offset.y == 0) {
+ break;
+ }
+ is(offset.y, maxScrollParentLayerPixels, "Async scroll y of scrollframe restored to " + offset.y);
+ state = 3;
+ break;
+
+ // Terminal state. The scroll position should stay at maxScrollParentLayerPixels
+ case 3:
+ is(offset.y, maxScrollParentLayerPixels, "Scroll position maintained");
+ break;
+ }
+ }
+ is(state, 3, "The scroll position did drop to 0 and then get restored properly");
+}
+
+if (isApzEnabled()) {
+ SimpleTest.waitForExplicitFinish();
+
+ pushPrefs([["apz.test.logging_enabled", true],
+ ["apz.displayport_expiry_ms", 0]])
+ .then(waitUntilApzStable)
+ .then(runContinuation(test))
+ .then(SimpleTest.finish);
+}
+
+</script>
+</body>
+</html>
generated by cgit v1.2.3 (git 2.25.1) at 2024-07-25 07:00:08 +0000