Implement customization of scroll bar colors on GTK 3

* src/gtkutil.c (xg_create_frame_widgets): Create CSS providers
for scroll bars.
(xg_finish_scroll_bar_creation): Attach created CSS providers.
* src/xfns.c (x_set_scroll_bar_foreground):
(x_set_scroll_bar_background): Put appropriate content into CSS
providers.
* src/xterm.c (x_free_frame_resources): Free CSS providers.
* src/xterm.h (struct x_output): New fields for scroll bar
stylesheet providers.

1 files changed, 7 insertions, 0 deletions

diff --git a/src/xterm.h b/src/xterm.h
index 4875eabafe6..5b199cab6b6 100644
--- a/src/xterm.h
+++ b/src/xterm.h
@@ -758,6 +758,13 @@ struct x_output
   GtkWindow *ttip_window;
 
   GtkIMContext *im_context;
+
+#ifdef HAVE_GTK3
+  /* The CSS providers used for scroll bar foreground and background
+     colors.  */
+  GtkCssProvider *scrollbar_foreground_css_provider;
+  GtkCssProvider *scrollbar_background_css_provider;
+#endif
 #endif /* USE_GTK */
 
   /* If >=0, a bitmap index.  The indicated bitmap is used for the