[pango: 1/2] pangowin32: add back the old font fallback list for each registered font

[Matthias Clasen <matthiasc src gnome org>]

commit 842e5675224adfc49ddadfeb084bf61166dc7101
Author: Christoph Reiter <reiter christoph gmail com>
Date:   Sun Jul 21 16:06:55 2019 +0200

    pangowin32: add back the old font fallback list for each registered font
    
    In f523c25c12c I changed the font fallback list from hardcoded to reading it from
    the registry to cover all potentially default Windows UI fonts. Turns out that this
    doesn't cover all of Unicode and breaks things like Marathi.
    
    This adds back the language specific font fallbacks to each font read from the registry
    to restore the old Unicode coverage.
    
    Fixes #375

 pango/pangowin32-fontmap.c | 11 +++++++++++
 1 file changed, 11 insertions(+)
---
diff --git a/pango/pangowin32-fontmap.c b/pango/pangowin32-fontmap.c
index 130b76e9..976a36cb 100644
--- a/pango/pangowin32-fontmap.c
+++ b/pango/pangowin32-fontmap.c
@@ -574,6 +574,17 @@ read_windows_fallbacks (GHashTable *ht_aliases)
           entry_len = wcslen (entry);
         }
       g_free (value_data);
+
+      /* For some reason the default fallback list doesn't cover all of Unicode
+       * and Windows has additional fonts for certain languages.
+       * Some of them are listed in
+       * SOFTWARE\Microsoft\Windows NT\CurrentVersion\FontMapperFamilyFallback
+       * but I couldn't find any docs for it. Feel free to improve this */
+      g_string_append (line_buffer,
+                       ",gisha,leelawadee,arial unicode ms,browallia new,"
+                       "mingliu,simhei,gulimche,ms gothic,sylfaen,kartika,"
+                       "latha,mangal,raavi");
+
       g_string_append (line_buffer, "\"");
 
       handle_alias_line (line_buffer, &errstring, ht_aliases);