Bug 1155359 - Set NS_FRAME_IS_BIDI on nsTextBoxFrame if text direction is set to RTL r=roc

layout/xul/nsTextBoxFrame.cpp

@@ -636,7 +636,8 @@ nsTextBoxFrame::CalculateTitleForWidth(nsPresContext*      aPresContext,
                                               aRenderingContext);
     if (titleWidth <= aWidth) {
         mCroppedTitle = mTitle;
-        if (HasRTLChars(mTitle)) {
+        if (HasRTLChars(mTitle) ||
+            StyleVisibility()->mDirection == NS_STYLE_DIRECTION_RTL) {
             mState |= NS_FRAME_IS_BIDI;
         }
         return titleWidth;  // fits, done.