[gtk+] checkbutton: Fix redraw issues

[Benjamin Otte <otte src gnome org>]

commit 442353fa9d78d6ada6991d4dcf8ba81c2dc52e0d
Author: Benjamin Otte <otte redhat com>
Date:   Sun Aug 17 06:24:41 2014 +0200

    checkbutton: Fix redraw issues
    
    This is a hack to get around the optimizations done by the CSS engine.
    
    The CSS engine will notice that no CSS properties changed on the
    widget itself when going from one state to another and not queue
    a redraw.
    And the reason for no properties changing will be that only the
    checkmark itself changes, but that is hidden behind a
    gtk_style_context_save()/_restore() pair, so it won't be caught.

 gtk/gtkcheckbutton.c |   20 ++++++++++++++++++++
 1 files changed, 20 insertions(+), 0 deletions(-)
---
diff --git a/gtk/gtkcheckbutton.c b/gtk/gtkcheckbutton.c
index 47dc6bb..c9adcc0 100644
--- a/gtk/gtkcheckbutton.c
+++ b/gtk/gtkcheckbutton.c
@@ -87,6 +87,25 @@ static void gtk_real_check_button_draw_indicator (GtkCheckButton      *check_but
 G_DEFINE_TYPE (GtkCheckButton, gtk_check_button, GTK_TYPE_TOGGLE_BUTTON)
 
 static void
+gtk_check_button_state_flags_changed (GtkWidget     *widget,
+                                     GtkStateFlags  previous_state_flags)
+{
+  /* FIXME
+   * This is a hack to get around the optimizations done by the CSS engine.
+   *
+   * The CSS engine will notice that no CSS properties changed on the
+   * widget itself when going from one state to another and not queue
+   * a redraw.
+   * And the reason for no properties changing will be that only the
+   * checkmark itself changes, but that is hidden behind a
+   * gtk_style_context_save()/_restore() pair, so it won't be caught.
+   */
+  gtk_widget_queue_draw (widget);
+
+  GTK_WIDGET_CLASS (gtk_check_button_parent_class)->state_flags_changed (widget, previous_state_flags);
+}
+
+static void
 gtk_check_button_class_init (GtkCheckButtonClass *class)
 {
   GtkWidgetClass *widget_class;
@@ -100,6 +119,7 @@ gtk_check_button_class_init (GtkCheckButtonClass *class)
   widget_class->get_preferred_height_and_baseline_for_width = 
gtk_check_button_get_preferred_height_and_baseline_for_width;
   widget_class->size_allocate = gtk_check_button_size_allocate;
   widget_class->draw = gtk_check_button_draw;
+  widget_class->state_flags_changed = gtk_check_button_state_flags_changed;
 
   class->draw_indicator = gtk_real_check_button_draw_indicator;