Bug 1815679 - Account for mRangeFlags in the userfont cache key. r=emilio

This is actually a bug that pre-dates the regression here, but I haven't seen a report
of it or a specific test failure that results. However, the new WPT reftests I'm
intending to land for the slant issue do exhibit a failure until this is fixed,
so let's go ahead and do it here.

Differential Revision: https://phabricator.services.mozilla.com/D169334

gfx/thebes/gfxUserFontSet.cpp

@@ -1160,6 +1160,7 @@ bool gfxUserFontSet::UserFontCache::Entry::KeyEquals(
   if (mFontEntry->SlantStyle() != fe->SlantStyle() ||
       mFontEntry->Weight() != fe->Weight() ||
       mFontEntry->Stretch() != fe->Stretch() ||
+      mFontEntry->mRangeFlags != fe->mRangeFlags ||
       mFontEntry->mFeatureSettings != fe->mFeatureSettings ||
       mFontEntry->mVariationSettings != fe->mVariationSettings ||
       mFontEntry->mLanguageOverride != fe->mLanguageOverride ||

gfx/thebes/gfxUserFontSet.h

@@ -436,7 +436,7 @@ class gfxUserFontSet {
             aKey->mFontEntry->Weight().AsScalar(),
             aKey->mFontEntry->SlantStyle().AsScalar(),
             aKey->mFontEntry->Stretch().AsScalar(),
-            aKey->mFontEntry->mLanguageOverride);
+            aKey->mFontEntry->mRangeFlags, aKey->mFontEntry->mLanguageOverride);
       }
 
       enum { ALLOW_MEMMOVE = false };