Bug 983699 - fix widgets in Australis overflow panel to show view on the right anchor, r=jaws

--HG--
extra : rebase_source : 99656dbcbda90cdb19b85c2e48795f7656fca697

browser/components/customizableui/src/CustomizableUI.jsm

@@ -1219,8 +1219,16 @@ let CustomizableUIInternal = {
       }
     } else if (aWidget.type == "view") {
       let ownerWindow = aNode.ownerDocument.defaultView;
-      ownerWindow.PanelUI.showSubView(aWidget.viewId, aNode,
-                                      this.getPlacementOfWidget(aNode.id).area);
+      let area = this.getPlacementOfWidget(aNode.id).area;
+      let anchor = aNode;
+      if (area != CustomizableUI.AREA_PANEL) {
+        let wrapper = this.wrapWidget(aWidget.id).forWindow(ownerWindow);
+        if (wrapper && wrapper.anchor) {
+          this.hidePanelForNode(aNode);
+          anchor = wrapper.anchor;
+        }
+      }
+      ownerWindow.PanelUI.showSubView(aWidget.viewId, anchor, area);
     }
   },