[gtksourceview] view: render highlight-current-line when window is active

[Christian Hergert <chergert src gnome org>]

commit 8d4b7f18ad0ed33f4f3f2921ca79f562925f2f8d
Author: Christian Hergert <chergert redhat com>
Date:   Tue Aug 30 13:15:42 2022 -0700

    view: render highlight-current-line when window is active
    
    If it is not active, then we want to be in something that is more akin to
    a "backdrop" state and ignore the current line highlight.

 gtksourceview/gtksourceview.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)
---
diff --git a/gtksourceview/gtksourceview.c b/gtksourceview/gtksourceview.c
index 80c3a279..cddbe44a 100644
--- a/gtksourceview/gtksourceview.c
+++ b/gtksourceview/gtksourceview.c
@@ -2718,6 +2718,8 @@ gtk_source_view_snapshot_layer (GtkTextView      *text_view,
 
        if (layer == GTK_TEXT_VIEW_LAYER_BELOW_TEXT)
        {
+               GtkRoot *root;
+
                /* Now draw the background pattern, which might draw above the
                 * right-margin area for additional texture. We can't really optimize
                 * these too much since they move every scroll. Otherwise we'd move
@@ -2729,9 +2731,15 @@ gtk_source_view_snapshot_layer (GtkTextView      *text_view,
                        gtk_source_view_paint_background_pattern_grid (view, snapshot);
                }
 
+               /* Only draw the line hightlight on the active window and if
+                * we are sensitive to keyboard input.
+                */
                if (gtk_widget_is_sensitive (GTK_WIDGET (view)) &&
                    priv->highlight_current_line &&
-                   priv->current_line_background_color_set)
+                   priv->current_line_background_color_set &&
+                   (root = gtk_widget_get_root (GTK_WIDGET (view))) &&
+                   GTK_IS_WINDOW (root) &&
+                   gtk_window_is_active (GTK_WINDOW (root)))
                {
                        gtk_source_view_paint_current_line_highlight (view, snapshot);
                }