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Test Info: Warnings
- This test gets skipped with pattern: os == 'linux' && devedition OR os == 'mac' OR os == 'win'
- Manifest: browser/base/content/test/performance/browser.toml
"use strict";
/**
* WHOA THERE: We should never be adding new things to EXPECTED_REFLOWS.
* Instead of adding reflows to the list, you should be modifying your code to
* avoid the reflow.
*
* for tips on how to do that.
*/
const EXPECTED_REFLOWS = [
/**
* Nothing here! Please don't add anything new!
*/
];
/*
* This test ensures that there are no unexpected
* uninterruptible reflows when closing new tabs.
*/
add_task(async function () {
// Force-enable tab animations
gReduceMotionOverride = false;
await ensureNoPreloadedBrowser();
await disableFxaBadge();
// The test starts on about:blank and opens an about:blank
// tab which triggers opening the toolbar since
// ensureNoPreloadedBrowser sets AboutNewTab.newTabURL to about:blank.
await SpecialPowers.pushPrefEnv({
set: [["browser.toolbars.bookmarks.visibility", "never"]],
});
let tab = await BrowserTestUtils.openNewForegroundTab(gBrowser);
await TestUtils.waitForCondition(() => tab._fullyOpen);
let tabStripRect =
gBrowser.tabContainer.arrowScrollbox.getBoundingClientRect();
let newTabButtonRect =
gBrowser.tabContainer.newTabButton.getBoundingClientRect();
let inRange = (val, min, max) => min <= val && val <= max;
// Add a reflow observer and open a new tab.
await withPerfObserver(
async function () {
let switchDone = BrowserTestUtils.waitForEvent(window, "TabSwitchDone");
gBrowser.removeTab(tab, { animate: true });
await BrowserTestUtils.waitForEvent(tab, "TabAnimationEnd");
await switchDone;
},
{
expectedReflows: EXPECTED_REFLOWS,
frames: {
filter: rects =>
rects.filter(
r =>
!(
// We expect all changes to be within the tab strip.
(
r.y1 >= tabStripRect.top &&
r.y2 <= tabStripRect.bottom &&
r.x1 >= tabStripRect.left &&
r.x2 <= tabStripRect.right &&
// The closed tab should disappear at the same time as the previous
// tab gets selected, causing both tab areas to change color at once:
// this should be a single rect of the width of 2 tabs, and can
// include the '+' button if it starts its animation.
((r.w > gBrowser.selectedTab.clientWidth &&
r.x2 <= newTabButtonRect.right) ||
// The '+' icon moves with an animation. At the end of the animation
// the former and new positions can touch each other causing the rect
// to have twice the icon's width.
(r.h == 13 && r.w <= 2 * 13 + kMaxEmptyPixels) ||
// We sometimes have a rect for the right most 2px of the '+' button.
(r.h == 2 && r.w == 2))
)
)
),
exceptions: [
{
name:
" as the closed one disappears",
condition: r =>
// In tab strip
r.y1 >= tabStripRect.top &&
r.y2 <= tabStripRect.bottom &&
r.x1 >= tabStripRect.left &&
r.x2 <= tabStripRect.right &&
// Width of one tab plus tab separator(s)
inRange(gBrowser.selectedTab.clientWidth - r.w, 0, 2),
},
{
condition: r =>
AppConstants.DEBUG &&
// In the content area
r.y1 >=
document.getElementById("appcontent").getBoundingClientRect()
.top,
},
],
},
}
);
is(EXPECTED_REFLOWS.length, 0, "No reflows are expected when closing a tab");
});