diff -r 000000000000 -r 6474c204b198 layout/xul/test/browser_bug706743.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/layout/xul/test/browser_bug706743.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,154 @@
+function test() {
+  waitForExplicitFinish();
+  gBrowser.selectedTab = gBrowser.addTab();
+
+  SpecialPowers.setIntPref("ui.tooltipDelay", 0);
+
+  let target;
+  let doc;
+  let win;
+  let callbackOnPopupShown;
+  let callbackOnPopupHidden;
+  let dragService = Components.classes["@mozilla.org/widget/dragservice;1"].
+                      getService(Components.interfaces.nsIDragService);
+
+  let onPopupHidden = function (aEvent)
+  {
+    if (aEvent.originalTarget.localName != "tooltip") {
+      return;
+    }
+    if (callbackOnPopupHidden) {
+      setTimeout(callbackOnPopupHidden, 0);
+    }
+  }
+
+  let onPopupShown = function (aEvent)
+  {
+    if (aEvent.originalTarget.localName != "tooltip") {
+      return;
+    }
+    if (callbackOnPopupShown) {
+      setTimeout(callbackOnPopupShown, 0);
+    }
+  }
+
+  let finishTest = function ()
+  {
+    document.removeEventListener("popupshown", onPopupShown, true);
+    document.removeEventListener("popuphidden", onPopupHidden, true);
+
+    SpecialPowers.clearUserPref("ui.tooltipDelay");
+
+    gBrowser.removeCurrentTab();
+    finish();
+  }
+
+  let testHideTooltipByMouseDown = function ()
+  {
+    callbackOnPopupShown = function () {
+      callbackOnPopupShown = null;
+      ok(true, "tooltip is shown before testing mousedown");
+
+      // hide tooltip by mousemove to outside.
+      callbackOnPopupHidden = function () {
+        callbackOnPopupHidden = null;
+        ok(true, "The tooltip is hidden by mousedown");
+
+        EventUtils.synthesizeMouse(target, 5, 15, { type: "mouseup" }, win);
+        EventUtils.synthesizeMouse(target, -5, 15, { type: "mousemove" }, win);
+
+        setTimeout(finishTest, 0);
+      }
+      EventUtils.synthesizeMouse(target, 5, 15, { type: "mousedown" }, win);
+    }
+    EventUtils.synthesizeMouse(target, 5, 15, { type: "mousemove" }, win);
+  }
+
+  let testShowTooltipAgain = function ()
+  {
+    // If tooltip listener used a flag for managing D&D state, we would need
+    // to test if the tooltip is shown after drag.
+    callbackOnPopupShown = function () {
+      callbackOnPopupShown = null;
+      ok(true, "tooltip is shown after drag");
+
+      // hide tooltip by mousemove to outside.
+      callbackOnPopupHidden = function () {
+        callbackOnPopupHidden = null;
+        ok(true, "The tooltip is hidden again");
+
+        setTimeout(testHideTooltipByMouseDown, 0);
+      }
+      EventUtils.synthesizeMouse(target, -5, 15, { type: "mousemove" }, win);
+    }
+    EventUtils.synthesizeMouse(target, 5, 15, { type: "mousemove" }, win);
+  }
+
+  let testDuringDnD = function ()
+  {
+    // mousemove into the target and start drag by emulation via nsIDragService.
+    // Note that on some platforms, we cannot actually start the drag by
+    // synthesized events.  E.g., Windows waits an actual mousemove event after
+    // dragstart.
+    callbackOnPopupShown = function () {
+      callbackOnPopupShown = null;
+      ok(false, "tooltip is shown during drag");
+    }
+    dragService.startDragSession();
+    // Emulate a buggy mousemove event.  widget might dispatch mousemove event
+    // during drag.
+    EventUtils.synthesizeMouse(target, 5, 15, { type: "mousemove" }, win);
+    setTimeout(function () {
+      callbackOnPopupShown = null;
+      ok(true, "tooltip isn't shown during drag");
+      dragService.endDragSession(true);
+      EventUtils.synthesizeMouse(target, -5, -5, { type: "mousemove" }, win);
+
+      setTimeout(testShowTooltipAgain, 0);
+    }, 100);
+  }
+
+  let onLoad = function (aEvent)
+  {
+    doc = gBrowser.contentDocument;
+    win = gBrowser.contentWindow;
+    target = doc.getElementById("target");
+
+    document.addEventListener("popupshown", onPopupShown, true);
+    document.addEventListener("popuphidden", onPopupHidden, true);
+
+    EventUtils.synthesizeMouse(target, -5, -5, { type: "mousemove" }, win);
+
+    // show tooltip by mousemove into target.
+    callbackOnPopupShown = function ()
+    {
+      callbackOnPopupShown = null;
+      ok(true, "The tooltip is shown");
+
+      // hide tooltip by mousemove to outside.
+      callbackOnPopupHidden = function () {
+        callbackOnPopupHidden = null;
+        ok(true, "The tooltip is hidden");
+
+        setTimeout(testDuringDnD, 0);
+      }
+      EventUtils.synthesizeMouse(target, -5, 15, { type: "mousemove" }, win);
+    }
+    EventUtils.synthesizeMouse(target, 5, 15, { type: "mousemove" }, win);
+  }
+
+  gBrowser.selectedBrowser.addEventListener("load",
+    function () {
+      gBrowser.selectedBrowser.
+        removeEventListener("load", arguments.callee, true);
+      setTimeout(onLoad, 0);
+   }, true);
+
+  content.location = "data:text/html,<html><head></head><body>" +
+    "<a id=\"target\" href=\"about:blank\" title=\"This is tooltip text\" " +
+       "style=\"display:block;height:20px;margin:10px;\" " +
+       "onclick=\"return false;\">here is an anchor element</a></body></html>";
+}
+
+
+