Bug 1102791 - Always return NS_FRAME_COMPLETE status from nsHTMLButtonControlFrame::Reflow. Don't create overflow container continuations unless the delegating frame has eCanContainOverflowContainers. r=roc

layout/forms/nsHTMLButtonControlFrame.cpp

@@ -203,6 +203,11 @@ nsHTMLButtonControlFrame::Reflow(nsPresContext* aPresContext,
   FinishReflowWithAbsoluteFrames(aPresContext, aDesiredSize,
                                  aReflowState, aStatus);
 
+  // We're always complete and we don't support overflow containers
+  // so we shouldn't have a next-in-flow ever.
+  aStatus = NS_FRAME_COMPLETE;
+  MOZ_ASSERT(!GetNextInFlow());
+
   NS_FRAME_SET_TRUNCATION(aStatus, aReflowState, aDesiredSize);
 }