import FIREFOX_52_6_0esr_RELEASE from mozilla-esr52 hg repo

toolkit/content/tests/browser/browser_autoscroll_disabled.js

@@ -0,0 +1,67 @@
+add_task(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);
+  gBrowser.loadURI(dataUri);
+  yield loadedPromise;
+
+  yield BrowserTestUtils.synthesizeMouse("#i", 50, 50, { button: 1 },
+                                         gBrowser.selectedBrowser);
+
+  yield ContentTask.spawn(gBrowser.selectedBrowser, { }, 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);
+    }
+  });
+
+  yield 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.
+  yield new Promise(resolve => window.requestAnimationFrame(resolve));
+
+  let msg = yield ContentTask.spawn(gBrowser.selectedBrowser, { }, 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.
+  yield SimpleTest.promiseFocus();
+});