Fix "symbol aliasing" code

Change-Id: Ic4605c40b9f3467f84732a0e3c956976fae68277

vcl/source/gdi/impfont.cxx

@@ -152,11 +152,15 @@ int ImplFontCharMap::GetGlyphIndex( sal_UCS4 cChar ) const
     // check that we are inside any range
     if( (nRange == 0) && (cChar < mpRangeCodes[0]) ) {
         // symbol aliasing gives symbol fonts a second chance
-        const bool bSymbolic = (mpRangeCodes[0]>=0xF000) && (mpRangeCodes[1]<=0xF0FF);
+        const bool bSymbolic = cChar <= 0xFF && (mpRangeCodes[0]>=0xF000) && (mpRangeCodes[1]<=0xF0FF);
         if( !bSymbolic )
             return 0;
         // check for symbol aliasing (U+F0xx -> U+00xx)
-        nRange = ImplFindRangeIndex( cChar | 0xF000 );
+        cChar |= 0xF000;
+        nRange = ImplFindRangeIndex( cChar );
+        if( (nRange == 0) && (cChar < mpRangeCodes[0]) ) {
+            return 0;
+        }
     }
     // check that we are inside a range
     if( (nRange & 1) != 0 )