forked from mirrors/gecko-dev
9866699154
MozReview-Commit-ID: 5xgXzdf68wg --HG-- extra : rebase_source : 860dfa16f24f9a70fb59c62184c2792dd41b92b0
81 lines
3.4 KiB
JavaScript
81 lines
3.4 KiB
JavaScript
"use strict";
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/**
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* WHOA THERE: We should never be adding new things to EXPECTED_REFLOWS. This
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* is a whitelist that should slowly go away as we improve the performance of
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* the front-end. Instead of adding more reflows to the whitelist, you should
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* be modifying your code to avoid the reflow.
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*
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* See https://developer.mozilla.org/en-US/Firefox/Performance_best_practices_for_Firefox_fe_engineers
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* for tips on how to do that.
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*/
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const EXPECTED_REFLOWS = [
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/**
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* Nothing here! Please don't add anything new!
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*/
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];
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/*
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* This test ensures that there are no unexpected
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* uninterruptible reflows when closing new tabs.
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*/
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add_task(async function() {
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await ensureNoPreloadedBrowser();
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let tab = await BrowserTestUtils.openNewForegroundTab(gBrowser);
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await BrowserTestUtils.waitForCondition(() => tab._fullyOpen);
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let tabStripRect = gBrowser.tabContainer.arrowScrollbox.getBoundingClientRect();
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let newTabButtonRect =
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document.getAnonymousElementByAttribute(gBrowser.tabContainer,
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"anonid", "tabs-newtab-button")
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.getBoundingClientRect();
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let inRange = (val, min, max) => min <= val && val <= max;
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// Add a reflow observer and open a new tab.
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await withPerfObserver(async function() {
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let switchDone = BrowserTestUtils.waitForEvent(window, "TabSwitchDone");
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gBrowser.removeTab(tab, { animate: true });
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await BrowserTestUtils.waitForEvent(tab, "transitionend",
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false, e => e.propertyName === "max-width");
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await switchDone;
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}, {expectedReflows: EXPECTED_REFLOWS,
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frames: {
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filter: rects => rects.filter(r => !(
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// We expect all changes to be within the tab strip.
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r.y1 >= tabStripRect.top && r.y2 <= tabStripRect.bottom &&
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r.x1 >= tabStripRect.left && r.x2 <= tabStripRect.right && (
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// The closed tab should disappear at the same time as the previous
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// tab gets selected, causing both tab areas to change color at once:
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// this should be a single rect of the width of 2 tabs, and can
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// include the '+' button if it starts its animation.
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(r.w > gBrowser.selectedTab.clientWidth &&
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r.x2 <= newTabButtonRect.right) ||
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// The '+' icon moves with an animation. At the end of the animation
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// the former and new positions can touch each other causing the rect
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// to have twice the icon's width.
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(r.h == 14 && r.w <= 2 * 14 + kMaxEmptyPixels) ||
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// We sometimes have a rect for the right most 2px of the '+' button.
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(r.h == 2 && r.w == 2)
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))),
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exceptions: [
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{name: "bug 1444886 - the next tab should be selected at the same time" +
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" as the closed one disappears",
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condition: r =>
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// In tab strip
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r.y1 >= tabStripRect.top && r.y2 <= tabStripRect.bottom &&
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r.x1 >= tabStripRect.left && r.x2 <= tabStripRect.right &&
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// Width of one tab plus tab separator(s)
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inRange(gBrowser.selectedTab.clientWidth - r.w, 0, 2)
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},
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{name: "bug 1446449 - spurious tab switch spinner",
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condition: r =>
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AppConstants.DEBUG &&
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// In the content area
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r.y1 >= document.getElementById("appcontent").getBoundingClientRect().top
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},
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]
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}
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});
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is(EXPECTED_REFLOWS.length, 0, "No reflows are expected when closing a tab");
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});
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