Bug 1047928 patch 7 - Don't rerun selector matching when user font set is updated. r=bzbarsky

layout/base/nsPresContext.cpp

@@ -2182,7 +2182,7 @@ nsPresContext::UserFontSetUpdated()
   //      requires rebuilding the rule tree from the top, avoiding the
   //      reuse of cached data even when no style rules have changed.
 
-  PostRebuildAllStyleDataEvent(NS_STYLE_HINT_REFLOW, eRestyle_Subtree);
+  PostRebuildAllStyleDataEvent(NS_STYLE_HINT_REFLOW, eRestyle_ForceDescendants);
 }
 
 FontFaceSet*