97580 Add EmbedPrivate::GetSize to match Resize

and don't call Resize if the allocation didn't
change dimensions.
Patch by tommi.komulainen@iki.fi r=blizzard sr=bryner

embedding/browser/gtk/src/EmbedPrivate.cpp

@@ -336,6 +336,13 @@ EmbedPrivate::Resize(PRUint32 aWidth, PRUint32 aHeight)
 			 0, 0, aWidth, aHeight);
 }
 
+void
+EmbedPrivate::GetSize(PRInt32 *aWidth, PRInt32 *aHeight)
+{
+  mWindow->GetDimensions(nsIEmbeddingSiteWindow::DIM_FLAGS_SIZE_INNER,
+			 nsnull, nsnull, aWidth, aHeight);
+}
+
 void
 EmbedPrivate::Destroy(void)
 {

embedding/browser/gtk/src/EmbedPrivate.h

@@ -78,6 +78,7 @@ class EmbedPrivate {
   void        Show            (void);
   void        Hide            (void);
   void        Resize          (PRUint32 aWidth, PRUint32 aHeight);
+  void        GetSize         (PRInt32 *aWidth, PRInt32 *aHeight);
   void        Destroy         (void);
   void        SetURI          (const char *aURI);
   void        LoadCurrentURI  (void);

embedding/browser/gtk/src/gtkmozembed2.cpp

@@ -710,10 +710,16 @@ gtk_moz_embed_size_allocate(GtkWidget *widget, GtkAllocation *allocation)
 
   if (GTK_WIDGET_REALIZED(widget))
   {
+    PRInt32 width, height;
+
+    embedPrivate->GetSize (&width, &height);
+
     gdk_window_move_resize(widget->window,
 			   allocation->x, allocation->y,
 			   allocation->width, allocation->height);
-    embedPrivate->Resize(allocation->width, allocation->height);
+
+    if ((allocation->width != width) || (allocation->height != height))
+      embedPrivate->Resize(allocation->width, allocation->height);
   }
 }