From 36d22d82aa202bb199967e9512281e9a53db42c9 Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Sun, 7 Apr 2024 21:33:14 +0200
Subject: Adding upstream version 115.7.0esr.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 .../content/test/tabs/browser_tabCloseSpacer.js    | 91 ++++++++++++++++++++++
 1 file changed, 91 insertions(+)
 create mode 100644 browser/base/content/test/tabs/browser_tabCloseSpacer.js

(limited to 'browser/base/content/test/tabs/browser_tabCloseSpacer.js')

diff --git a/browser/base/content/test/tabs/browser_tabCloseSpacer.js b/browser/base/content/test/tabs/browser_tabCloseSpacer.js
new file mode 100644
index 0000000000..6996546be2
--- /dev/null
+++ b/browser/base/content/test/tabs/browser_tabCloseSpacer.js
@@ -0,0 +1,91 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+/**
+ * Tests that while clicking to close tabs, the close button remains under the mouse
+ * even when an underflow happens.
+ */
+add_task(async function () {
+  // Disable tab animations
+  gReduceMotionOverride = true;
+
+  let downButton = gBrowser.tabContainer.arrowScrollbox._scrollButtonDown;
+  let closingTabsSpacer = gBrowser.tabContainer._closingTabsSpacer;
+  let arrowScrollbox = gBrowser.tabContainer.arrowScrollbox;
+
+  await BrowserTestUtils.overflowTabs(registerCleanupFunction, window);
+
+  // Make sure scrolling finished.
+  await new Promise(resolve => {
+    arrowScrollbox.addEventListener("scrollend", resolve, { once: true });
+  });
+
+  ok(
+    gBrowser.tabContainer.hasAttribute("overflow"),
+    "Tab strip should be overflowing"
+  );
+  isnot(downButton.clientWidth, 0, "down button has some width");
+  is(closingTabsSpacer.clientWidth, 0, "spacer has no width");
+
+  let originalCloseButtonLocation = getLastCloseButtonLocation();
+
+  info(
+    "Removing half the tabs and making sure the last close button doesn't move"
+  );
+  let numTabs = gBrowser.tabs.length / 2;
+  while (gBrowser.tabs.length > numTabs) {
+    let lastCloseButtonLocation = getLastCloseButtonLocation();
+    Assert.equal(
+      lastCloseButtonLocation.top,
+      originalCloseButtonLocation.top,
+      "The top of all close buttons should be equal"
+    );
+    Assert.equal(
+      lastCloseButtonLocation.bottom,
+      originalCloseButtonLocation.bottom,
+      "The bottom of all close buttons should be equal"
+    );
+    Assert.equal(
+      lastCloseButtonLocation.right,
+      originalCloseButtonLocation.right,
+      "The right side of the close button should remain consistent"
+    );
+    // Ignore 'left' since non-hovered tabs have their close button
+    // narrower to display more tab label.
+
+    EventUtils.synthesizeMouseAtCenter(getLastCloseButton(), {});
+    await new Promise(r => requestAnimationFrame(r));
+  }
+
+  ok(!gBrowser.tabContainer.hasAttribute("overflow"), "not overflowing");
+  ok(
+    gBrowser.tabContainer.hasAttribute("using-closing-tabs-spacer"),
+    "using spacer"
+  );
+
+  is(downButton.clientWidth, 0, "down button has no width");
+  isnot(closingTabsSpacer.clientWidth, 0, "spacer has some width");
+});
+
+function getLastCloseButton() {
+  let lastTab = gBrowser.tabs[gBrowser.tabs.length - 1];
+  return lastTab.closeButton;
+}
+
+function getLastCloseButtonLocation() {
+  let rect = getLastCloseButton().getBoundingClientRect();
+  return {
+    left: Math.round(rect.left),
+    top: Math.round(rect.top),
+    width: Math.round(rect.width),
+    height: Math.round(rect.height),
+  };
+}
+
+registerCleanupFunction(() => {
+  while (gBrowser.tabs.length > 1) {
+    BrowserTestUtils.removeTab(gBrowser.tabs[0]);
+  }
+});
-- 
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