Opening a URL in editor always checks for existing window, b=64129, r=mjudge, sr=sfraser

xpfe/browser/resources/content/openLocation.js

@@ -92,7 +92,9 @@ function open()
         window.opener.delayedOpenWindow(getBrowserURL(), "all,dialog=no", dialog.input.value);
         break;
       case "2":
-        window.opener.delayedOpenWindow("chrome://editor/content", "chrome,all,dialog=no", dialog.input.value);
+        // editPage is in utilityOverlay.js (all editor openers with URL should use this)
+        // 3rd param tells editPage to use "delayedOpenWindow"
+        editPage(dialog.input.value, window.opener, true);
         break;
     }
   }

xpfe/communicator/resources/content/contentAreaUtils.js

@@ -101,10 +101,7 @@
     return true;
   }
 
-  function editPage(url)
-  {
-    window.openDialog( "chrome://editor/content", "_blank", "chrome,all,dialog=no", url );
-  }
+  //Note: "function editPage(url)" was moved to utilityOverlay.js
 
   function findParentNode(node, parentNode)
   {

xpfe/communicator/resources/content/utilityOverlay.js

@@ -402,6 +402,44 @@ function NewEditorFromDraft()
   // XXX not implemented
 }
 
+// Any non-editor window wanting to create an editor with a URL
+//   should use this instead of "window.openDialog..."
+//  We must always find an existing window with requested URL
+// (When calling from a dialog, "launchWindow" is dialog's "opener"
+//   and we need a delay to let dialog close)
+function editPage(url, launchWindow, delay)
+{
+  // User may not have supplied a window
+  if (!launchWindow)
+    launchWindow = window;
+
+  var windowManager = Components.classes['@mozilla.org/rdf/datasource;1?name=window-mediator'].getService();
+  if (!windowManager) return;
+  var windowManagerInterface = windowManager.QueryInterface( Components.interfaces.nsIWindowMediator);
+  if ( !windowManagerInterface ) return;
+  var enumerator = windowManagerInterface.getEnumerator( "composer:html" );
+  if ( !enumerator ) return;
+
+  while ( enumerator.hasMoreElements() )
+  {
+    var window = windowManagerInterface.convertISupportsToDOMWindow( enumerator.getNext() );
+    if ( window && window.editorShell)
+    {
+      if (window.editorShell.checkOpenWindowForURLMatch(url, window))
+      {
+        // We found an editor with our url
+        window.focus();
+        return;
+      }
+    }
+  }
+  
+  // Create new Composer window
+  if (delay)
+    launchWindow.delayedOpenWindow("chrome://editor/content", "chrome,all,dialog=no", url);
+  else
+    launchWindow.openDialog("chrome://editor/content", "_blank", "chrome,all,dialog=no", url);
+}
 
 function helpMenuCreate()
 {