[gtksourceview] styleschemepreview: tweak textview margins

[Christian Hergert <chergert src gnome org>]

commit a543d5fe4f5fb771d06b02916f4287040c84addb
Author: Christian Hergert <chergert redhat com>
Date:   Tue Oct 12 11:41:05 2021 -0700

    styleschemepreview: tweak textview margins
    
    This is needed to align things closer to the design.

 gtksourceview/gtksourcestyleschemepreview.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)
---
diff --git a/gtksourceview/gtksourcestyleschemepreview.c b/gtksourceview/gtksourcestyleschemepreview.c
index 3ba6bffd..d0f6f528 100644
--- a/gtksourceview/gtksourcestyleschemepreview.c
+++ b/gtksourceview/gtksourcestyleschemepreview.c
@@ -187,9 +187,9 @@ gtk_source_style_scheme_preview_constructed (GObject *object)
                             "editable", FALSE,
                             "right-margin-position", 40,
                             "show-right-margin", TRUE,
-                            "top-margin", 9,
-                            "bottom-margin", 9,
-                            "left-margin", 0,
+                            "top-margin", 6,
+                            "bottom-margin", 6,
+                            "left-margin", 3,
                             "width-request", 120,
                             "right-margin", 9,
                             "show-line-numbers", TRUE,