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[tor-commits] [tor-browser/tor-browser-91.4.0esr-11.5-1] Bug 1745715 - Process app-bundled fonts before system fonts when initializing the font list, to ensure their families get the expected Base visibility level. r=emilio



commit 6ebf4b5c74896f0d30c061d6c61e98586ff2ca79
Author: Jonathan Kew <jkew@xxxxxxxxxxx>
Date:   Mon Dec 13 20:09:36 2021 +0000

    Bug 1745715 - Process app-bundled fonts before system fonts when initializing the font list, to ensure their families get the expected Base visibility level. r=emilio
    
    Differential Revision: https://phabricator.services.mozilla.com/D133667
---
 gfx/thebes/gfxFcPlatformFontList.cpp | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/gfx/thebes/gfxFcPlatformFontList.cpp b/gfx/thebes/gfxFcPlatformFontList.cpp
index 41a305c537c4..3b6029bd4353 100644
--- a/gfx/thebes/gfxFcPlatformFontList.cpp
+++ b/gfx/thebes/gfxFcPlatformFontList.cpp
@@ -1524,17 +1524,21 @@ nsresult gfxFcPlatformFontList::InitFontListForPlatform() {
   }
 #endif
 
-  // iterate over available fonts
-  FcFontSet* systemFonts = FcConfigGetFonts(nullptr, FcSetSystem);
-  AddFontSetFamilies(systemFonts, policy.get(), /* aAppFonts = */ false);
-
 #ifdef MOZ_BUNDLED_FONTS
+  // https://bugzilla.mozilla.org/show_bug.cgi?id=1745715:
+  // It's important to do this *before* processing the standard system fonts,
+  // so that if a family is present in both font sets, we'll treat it as app-
+  // bundled and therefore always visible.
   if (StaticPrefs::gfx_bundled_fonts_activate_AtStartup() != 0) {
     FcFontSet* appFonts = FcConfigGetFonts(nullptr, FcSetApplication);
     AddFontSetFamilies(appFonts, policy.get(), /* aAppFonts = */ true);
   }
 #endif
 
+  // iterate over available fonts
+  FcFontSet* systemFonts = FcConfigGetFonts(nullptr, FcSetSystem);
+  AddFontSetFamilies(systemFonts, policy.get(), /* aAppFonts = */ false);
+
   return NS_OK;
 }
 

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