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"use strict";
/**
* Ensure redundant style flushes are not triggered when switching between windows
*/
add_task(async function test_toolbar_element_restyles_on_activation() {
let restyles = {
win1: {},
win2: {},
};
// create a window and snapshot the elementsStyled
let win1 = await BrowserTestUtils.openNewBrowserWindow();
await new Promise(resolve => waitForFocus(resolve, win1));
// create a 2nd window and snapshot the elementsStyled
let win2 = await BrowserTestUtils.openNewBrowserWindow();
await new Promise(resolve => waitForFocus(resolve, win2));
// (De)-activate both windows once before we take a measurement. The first
// (de-)activation may flush styles, after that the style data should be
// cached.
win1.focus();
win2.focus();
// Flush any pending styles before we take a measurement.
win1.getComputedStyle(win1.document.firstElementChild);
win2.getComputedStyle(win2.document.firstElementChild);
// Clear the focused element from each window so that when
// we raise them, the focus of the element doesn't cause an
// unrelated style flush.
Services.focus.clearFocus(win1);
Services.focus.clearFocus(win2);
let utils1 = SpecialPowers.getDOMWindowUtils(win1);
restyles.win1.initial = utils1.restyleGeneration;
let utils2 = SpecialPowers.getDOMWindowUtils(win2);
restyles.win2.initial = utils2.restyleGeneration;
// switch back to 1st window, and snapshot elementsStyled
win1.focus();
restyles.win1.activate = utils1.restyleGeneration;
restyles.win2.deactivate = utils2.restyleGeneration;
// switch back to 2nd window, and snapshot elementsStyled
win2.focus();
restyles.win2.activate = utils2.restyleGeneration;
restyles.win1.deactivate = utils1.restyleGeneration;
is(
restyles.win1.activate - restyles.win1.deactivate,
0,
"No elements restyled when re-activating/deactivating a window"
);
is(
restyles.win2.activate - restyles.win2.deactivate,
0,
"No elements restyled when re-activating/deactivating a window"
);
await BrowserTestUtils.closeWindow(win1);
await BrowserTestUtils.closeWindow(win2);
});
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