Revert "Prevent blinking of appicon double-clicking on it."

This reverts commit 5385fd3191.

Source/NSApplication.m

@@ -434,11 +434,6 @@ NSApplication	*NSApp = nil;
   return NO;
 }
 
-- (BOOL) becomesKeyOnlyIfNeeded
-{
-  return YES;
-}
-
 - (BOOL) worksWhenModal
 {
   return YES;
@@ -547,11 +542,6 @@ static NSSize scaledIconSizeForSize(NSSize imageSize)
   return YES;
 }
 
-- (BOOL) needsPanelToBecomeKey
-{
-  return NO;
-}
-
 - (void) concludeDragOperation: (id<NSDraggingInfo>)sender
 {
 }