[meld] sourceview: Fix the commit message textview not getting preferences

[Kai Willadsen <kaiw src gnome org>]

commit 2d57bb4d9fd4455bf23bd8050bd6b5f8c2f2544b
Author: Kai Willadsen <kai willadsen gmail com>
Date:   Sun Jul 14 07:19:14 2019 +1000

    sourceview: Fix the commit message textview not getting preferences
    
    This has been broken for a while...

 meld/sourceview.py | 15 ++++++++++++++-
 1 file changed, 14 insertions(+), 1 deletion(-)
---
diff --git a/meld/sourceview.py b/meld/sourceview.py
index 7daf9d2e..828b5a3e 100644
--- a/meld/sourceview.py
+++ b/meld/sourceview.py
@@ -393,11 +393,24 @@ class CommitMessageSourceView(GtkSource.View):
 
     __gtype_name__ = "CommitMessageSourceView"
 
-    __gsettings_bindings__ = (
+    __gsettings_bindings_view__ = (
         ('indent-width', 'tab-width'),
         ('insert-spaces-instead-of-tabs', 'insert-spaces-instead-of-tabs'),
+        ('enable-space-drawer', 'enable-space-drawer'),
     )
 
+    enable_space_drawer = GObject.Property(type=bool, default=False)
+
+    def do_realize(self):
+        bind_settings(self)
+
+        self.bind_property(
+            'enable-space-drawer', self.props.space_drawer, 'enable-matrix',
+            GObject.BindingFlags.DEFAULT | GObject.BindingFlags.SYNC_CREATE,
+        )
+
+        return GtkSource.View.do_realize(self)
+
 
 class MeldSourceMap(GtkSource.Map, SourceViewHelperMixin):