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Test Info:

/* Any copyright is dedicated to the Public Domain.
"use strict";
const WIDGET_ID = "search-container";
registerCleanupFunction(() => {
CustomizableUI.reset();
Services.prefs.clearUserPref("browser.search.widget.inNavBar");
});
add_task(async function test_syncPreferenceWithWidget() {
// Move the searchbar to the nav bar.
CustomizableUI.addWidgetToArea(WIDGET_ID, CustomizableUI.AREA_NAVBAR);
let container = document.getElementById(WIDGET_ID);
// Set a disproportionately large width, which could be from a saved bigger
// window, or what not.
let width = window.innerWidth * 2;
container.setAttribute("width", width);
container.style.width = `${width}px`;
// Stuff shouldn't overflow.
Assert.less(
container.getBoundingClientRect().width,
window.innerWidth,
"Searchbar shouldn't overflow"
);
});