Bug #282506 --> Inline spell check words go blank while message is being sent

because the text frame is hiding selection text for disabled text nodes. We should never hide
the selection if it is of type spellcheck.

sr=dbaron

layout/generic/nsTextFrame.cpp

@@ -3384,7 +3384,7 @@ nsTextFrame::PaintAsciiText(nsPresContext* aPresContext,
         sdptr = sdptr->mNext;
       }
 
-      if (!hideStandardSelection) {
+      if (!hideStandardSelection || displaySelection) {
         //ITS OK TO CAST HERE THE RESULT WE USE WILLNOT DO BAD CONVERSION
         DrawSelectionIterator iter(content, details,(PRUnichar *)text,(PRUint32)textLength,aTextStyle,
                                    selectionValue, aPresContext, mStyleContext);