[gtksourceview] css.lang: Add support for 8 and 4 digit hex color notation

[Sébastien Wilmet <swilmet src gnome org>]

commit 2f149e62b40ba8db95b3cf15b985e27565003047
Author: Tobias Schönberg <tobias47n9e gmail com>
Date:   Sun Aug 21 18:10:20 2016 +0200

    css.lang: Add support for 8 and 4 digit hex color notation
    
    Currently 8 digit (e.g. '#aabbccff') and four digit (e.g.
    '#abcf') color notation is not highlighted similar to other
    hexadecimal colors.
    This commit updates the 'hexadecimal-color' context to fix
    the issue.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=770206

 data/language-specs/css.lang |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/data/language-specs/css.lang b/data/language-specs/css.lang
index c88a3dc..eef1a6d 100644
--- a/data/language-specs/css.lang
+++ b/data/language-specs/css.lang
@@ -138,7 +138,7 @@
     </context>
 
     <context id="hexadecimal-color" style-ref="color">
-      <match>#([a-fA-F0-9]{6}|[a-fA-F0-9]{3})\b</match>
+      <match>#([a-fA-F0-9]{8}|[a-fA-F0-9]{6}|[a-fA-F0-9]{4}|[a-fA-F0-9]{3})\b</match>
     </context>
 
     <context id="named-color" style-ref="color">