Bug 782660. Resizing a text control frame with borders should invalidate the borders as needed. r=roc

layout/forms/nsTextControlFrame.cpp

@@ -543,6 +543,10 @@ nsTextControlFrame::Reflow(nsPresContext*   aPresContext,
     ReflowTextControlChild(kid, aPresContext, aReflowState, aStatus, aDesiredSize);
     kid = kid->GetNextSibling();
   }
+
+  // If we're resizing, we might need to invalidate our border areas and such
+  CheckInvalidateSizeChange(aDesiredSize);
+
   // take into account css properties that affect overflow handling
   FinishAndStoreOverflow(&aDesiredSize);