browser_toolbariconcolor_restyles.js

Enable keyboard shortcuts

"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);

});