Bug 728887 - Double clicking a tab group creates a new group under it; r=dietrich

browser/components/tabview/test/Makefile.in

@@ -169,6 +169,7 @@ _BROWSER_FILES = \
                  browser_tabview_bug706430.js \
                  browser_tabview_bug706736.js \
                  browser_tabview_bug707466.js \
+                 browser_tabview_bug728887.js \
                  browser_tabview_click_group.js \
                  browser_tabview_dragdrop.js \
                  browser_tabview_exit_button.js \

browser/components/tabview/test/browser_tabview_bug728887.js

@@ -0,0 +1,15 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+function test() {
+  waitForExplicitFinish();
+
+  showTabView(function () {
+    let cw = TabView.getContentWindow();
+    let target = cw.GroupItems.groupItems[0].container;
+    EventUtils.sendMouseEvent({type: "dblclick", button: 0}, target, cw);
+    is(cw.GroupItems.groupItems.length, 1, "one groupItem after double clicking");
+
+    hideTabView(finish);
+  });
+}

browser/components/tabview/ui.js

@@ -205,6 +205,9 @@ let UI = {
       });
 
       iQ(gTabViewFrame.contentDocument).dblclick(function(e) {
+        if (e.originalTarget.id != "content")
+          return;
+
         // Create a group with one tab on double click
         let box =
           new Rect(e.clientX - Math.floor(TabItems.tabWidth/2),