[gtksourceview] css: drop line-height usage

[Christian Hergert <chergert src gnome org>]

commit 366a56b2aff11673d2ef2ab3ce7d131b92b16ce2
Author: Christian Hergert <chergert redhat com>
Date:   Thu Jan 6 22:30:25 2022 -0800

    css: drop line-height usage
    
    We can't use this yet until we can depend on GTK 4.5.x which is not yet
    available in CI.

 gtksourceview/GtkSourceView.css | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/gtksourceview/GtkSourceView.css b/gtksourceview/GtkSourceView.css
index e049364c..2923c58d 100644
--- a/gtksourceview/GtkSourceView.css
+++ b/gtksourceview/GtkSourceView.css
@@ -169,5 +169,5 @@ GtkSourceStyleSchemePreview.selected image {
 
 textview.GtkSourceMap {
   font-size: 1.75pt;
-  line-height: 4px;
+  /* Requires GTK 4.6: line-height: 4px; */
 }