b=513192; Crash [@nsAString_internal::BeginReading(nsReadingIterator<unsigned short>&)]; r=jfkthame

gfx/thebes/src/gfxWindowsPlatform.cpp

@@ -620,7 +620,11 @@ gfxWindowsPlatform::FindFontForCharProc(nsStringHashKey::KeyType aKey,
     if (!fe)
         return PL_DHASH_NEXT;
 
-    PRInt32 rank = 0;
+    // initialize rank to 1 so that any match is better than the initial
+    // value of data->mMatchRank (zero); therefore the first font that
+    // passes the mCharacterMap.test() will become the mBestMatch until
+    // a better entry is found
+    PRInt32 rank = 1;
 
     // skip over non-unicode and bitmap fonts and fonts that don't have
     // the code point we're looking for