fix behavior of simple click within selected text; optimize setNeedsDisplayInRect: when called with empty rect

git-svn-id: svn+ssh://svn.gna.org/svn/gnustep/libs/gui/trunk@29914 72102866-910b-0410-8b05-ffd578937521

Source/NSView.m

@@ -2721,6 +2721,9 @@ in the main thread.
  */
 - (void) setNeedsDisplayInRect: (NSRect)invalidRect
 {
+  if (NSIsEmptyRect(invalidRect))
+    return; // avoid unnecessary work when rectangle is empty
+	
   NSValue *v = [[NSValue alloc]
 		 initWithBytes: &invalidRect
 		 objCType: @encode(NSRect)];