Fix for bug 111264: nsTextFrame::SetSelected() calls Invalidate() with empty rect.

Prevent SetSelected() from generating invalidate warnings by
preventing calls to Invalidate with an empty rect.

r=jfrancis@netscape.com  sr=attinasi@netscape.com

layout/generic/nsTextFrame.cpp

@@ -3587,6 +3587,7 @@ nsTextFrame::SetSelected(nsIPresContext* aPresContext,
     nsRect frameRect;
     GetRect(frameRect);
     nsRect rect(0, 0, frameRect.width, frameRect.height);
+    if (!rect.IsEmpty())
       Invalidate(aPresContext, rect, PR_FALSE);
 //    ForceDrawFrame(this);
   }

layout/html/base/src/nsTextFrame.cpp

@@ -3587,6 +3587,7 @@ nsTextFrame::SetSelected(nsIPresContext* aPresContext,
     nsRect frameRect;
     GetRect(frameRect);
     nsRect rect(0, 0, frameRect.width, frameRect.height);
+    if (!rect.IsEmpty())
       Invalidate(aPresContext, rect, PR_FALSE);
 //    ForceDrawFrame(this);
   }