1 files changed, 82 insertions, 0 deletions
diff --git a/toolkit/content/tests/browser/browser_autoscroll_disabled.js b/toolkit/content/tests/browser/browser_autoscroll_disabled.js
new file mode 100644
index 0000000000..e69c319d17
--- /dev/null
+++ b/toolkit/content/tests/browser/browser_autoscroll_disabled.js
@@ -0,0 +1,82 @@
+add_task(async function () {
+  const kPrefName_AutoScroll = "general.autoScroll";
+  Services.prefs.setBoolPref(kPrefName_AutoScroll, false);
+
+  let dataUri =
+    'data:text/html,<html><body id="i" style="overflow-y: scroll"><div style="height: 2000px"></div>\
+      <iframe id="iframe" style="display: none;"></iframe>\
+</body></html>';
+
+  let loadedPromise = BrowserTestUtils.browserLoaded(gBrowser.selectedBrowser);
+  BrowserTestUtils.loadURIString(gBrowser, dataUri);
+  await loadedPromise;
+
+  await BrowserTestUtils.synthesizeMouse(
+    "#i",
+    50,
+    50,
+    { button: 1 },
+    gBrowser.selectedBrowser
+  );
+
+  await SpecialPowers.spawn(gBrowser.selectedBrowser, [], async function () {
+    var iframe = content.document.getElementById("iframe");
+
+    if (iframe) {
+      var e = new iframe.contentWindow.PageTransitionEvent("pagehide", {
+        bubbles: true,
+        cancelable: true,
+        persisted: false,
+      });
+      iframe.contentDocument.dispatchEvent(e);
+      iframe.contentDocument.documentElement.dispatchEvent(e);
+    }
+  });
+
+  await BrowserTestUtils.synthesizeMouse(
+    "#i",
+    100,
+    100,
+    { type: "mousemove", clickCount: "0" },
+    gBrowser.selectedBrowser
+  );
+
+  // If scrolling didn't work, we wouldn't do any redraws and thus time out, so
+  // request and force redraws to get the chance to check for scrolling at all.
+  await new Promise(resolve => window.requestAnimationFrame(resolve));
+
+  let msg = await SpecialPowers.spawn(
+    gBrowser.selectedBrowser,
+    [],
+    async function () {
+      // Skip the first animation frame callback as it's the same callback that
+      // the browser uses to kick off the scrolling.
+      return new Promise(resolve => {
+        function checkScroll() {
+          let msg = "";
+          let elem = content.document.getElementById("i");
+          if (elem.scrollTop != 0) {
+            msg += "element should not have scrolled vertically";
+          }
+          if (elem.scrollLeft != 0) {
+            msg += "element should not have scrolled horizontally";
+          }
+
+          resolve(msg);
+        }
+
+        content.requestAnimationFrame(checkScroll);
+      });
+    }
+  );
+
+  ok(!msg, "element scroll " + msg);
+
+  // restore the changed prefs
+  if (Services.prefs.prefHasUserValue(kPrefName_AutoScroll)) {
+    Services.prefs.clearUserPref(kPrefName_AutoScroll);
+  }
+
+  // wait for focus to fix a failure in the next test if the latter runs too soon.
+  await SimpleTest.promiseFocus();
+});