fix bug 84668. r=shanjian sr=alecf

on simplfied chinese window. force any return value of
system font size < 9 to be at least 9 because we know
the glyph less than 9 look very very ugly on SimpChinese system

gfx/src/windows/nsDeviceContextWin.cpp

@@ -498,6 +498,15 @@ nsresult nsDeviceContextWin :: GetSysFontInfo(HDC aHDC, nsSystemFontID anID, nsF
     return NS_ERROR_FAILURE;
   }
 
+  // we have problem on Simplified Chinese system because the system report
+  // the default font size is 8. but if we use 8, the text display very
+  // Ugly. force it to be at least 9 on that system (cp936)
+
+  if ((-9 < ptrLogFont->lfHeight) && 
+      (ptrLogFont->lfHeight < 9) && 
+      (936 == ::GetACP())) 
+    ptrLogFont->lfHeight = (ptrLogFont->lfHeight > 0) ? 9 : -9;
+
   return CopyLogFontToNSFont(&aHDC, ptrLogFont, aFont);
 }