forked from mirrors/gecko-dev
6b7e2645f9
Differential Revision: https://phabricator.services.mozilla.com/D23191 --HG-- extra : moz-landing-system : lando
87 lines
2.8 KiB
JavaScript
87 lines
2.8 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 opening a new tab that will
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* cause the existing tabs to squeeze smaller.
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*/
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add_task(async function() {
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await ensureNoPreloadedBrowser();
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// Compute the number of tabs we can put into the strip without
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// overflowing, and remove one, so that we can create
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// TAB_COUNT_FOR_SQUEEE tabs, and then one more, which should
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// cause the tab to squeeze to a smaller size rather than overflow.
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const TAB_COUNT_FOR_SQUEEZE = computeMaxTabCount() - 1;
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await createTabs(TAB_COUNT_FOR_SQUEEZE);
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await ensureFocusedUrlbar();
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let tabStripRect = gBrowser.tabContainer.arrowScrollbox.getBoundingClientRect();
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let textBoxRect = gURLBar
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.querySelector("moz-input-box")
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.getBoundingClientRect();
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await withPerfObserver(
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async function() {
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let switchDone = BrowserTestUtils.waitForEvent(window, "TabSwitchDone");
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BrowserOpenTab();
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await BrowserTestUtils.waitForEvent(
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gBrowser.selectedTab,
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"TabAnimationEnd"
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);
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await switchDone;
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},
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{
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expectedReflows: EXPECTED_REFLOWS,
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frames: {
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filter: rects =>
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rects.filter(
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r =>
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!// We expect plenty of changed rects within the tab strip.
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(
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r.y1 >= tabStripRect.top &&
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r.y2 <= tabStripRect.bottom &&
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r.x1 >= tabStripRect.left &&
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r.x2 <= tabStripRect.right &&
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// It would make sense for each rect to have a width smaller than
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// a tab (ie. tabstrip.width / tabcount), but tabs are small enough
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// that they sometimes get reported in the same rect.
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// So we accept up to the width of n-1 tabs.
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r.w <=
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(gBrowser.tabs.length - 1) *
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Math.ceil(tabStripRect.width / gBrowser.tabs.length)
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)
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),
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exceptions: [
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{
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name: "the urlbar placeolder moves up and down by a few pixels",
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condition: r =>
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r.x1 >= textBoxRect.left &&
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r.x2 <= textBoxRect.right &&
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r.y1 >= textBoxRect.top &&
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r.y2 <= textBoxRect.bottom,
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},
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],
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},
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}
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);
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await removeAllButFirstTab();
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});
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