[gtksourceview] Adwaita.xml: tweak XML styling

[Christian Hergert <chergert src gnome org>]

commit fe832cb139fe0800cd7707fb0db07b5c7eeb2922
Author: Christian Hergert <chergert redhat com>
Date:   Thu Dec 30 11:44:55 2021 -0800

    Adwaita.xml: tweak XML styling

 data/styles/Adwaita.xml | 4 ++++
 1 file changed, 4 insertions(+)
---
diff --git a/data/styles/Adwaita.xml b/data/styles/Adwaita.xml
index 128fb4e9..138bd14a 100644
--- a/data/styles/Adwaita.xml
+++ b/data/styles/Adwaita.xml
@@ -147,6 +147,10 @@
 
   <style name="css:property-name"           foreground="dark1" bold="true"/>
 
+  <style name="xml:element-name"            foreground="teal" bold="true"/>
+  <style name="xml:attribute-name"          foreground="pink1"/>
+  <style name="xml:attribute-value"         foreground="text4"/>
+
   <style name="def:base-n-integer"          foreground="numbers"/>
   <style name="def:builtin"                 bold="true"/>
   <style name="def:boolean"                 foreground="numbers"/>