bug 752455 - don't allow word break within cluster when copying glyph data for text-transform. r=smontagu

gfx/thebes/gfxFont.cpp

@@ -5333,7 +5333,9 @@ gfxTextRun::CopyGlyphDataFrom(gfxTextRun *aSource, PRUint32 aStart,
     CompressedGlyph *dstGlyphs = mCharacterGlyphs + aDest;
     for (PRUint32 i = 0; i < aLength; ++i) {
         CompressedGlyph g = srcGlyphs[i];
-        g.SetCanBreakBefore(dstGlyphs[i].CanBreakBefore());
+        g.SetCanBreakBefore(!g.IsClusterStart() ?
+            CompressedGlyph::FLAG_BREAK_TYPE_NONE :
+            dstGlyphs[i].CanBreakBefore());
         if (!g.IsSimpleGlyph()) {
             PRUint32 count = g.GetGlyphCount();
             if (count > 0) {