[gtk+] range: Fix gadget state propagation

[Matthias Clasen <matthiasc src gnome org>]

commit fa48dbf1a58c01f06218accd3ec0c1b5ffceca02
Author: Matthias Clasen <mclasen redhat com>
Date:   Wed Mar 9 14:15:40 2016 -0500

    range: Fix gadget state propagation
    
    The contents node was not getting state updates at all, and the
    trough node was missing some state updates as well, because we
    were not calling update_trough_state() in all the places where
    it is needed.

 gtk/gtkrange.c |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)
---
diff --git a/gtk/gtkrange.c b/gtk/gtkrange.c
index c85c203..b9fada2 100644
--- a/gtk/gtkrange.c
+++ b/gtk/gtkrange.c
@@ -2302,6 +2302,8 @@ update_trough_state (GtkRange *range)
 
   state &= ~(GTK_STATE_FLAG_PRELIGHT | GTK_STATE_FLAG_ACTIVE);
 
+  gtk_css_gadget_set_state (priv->contents_gadget, state);
+
   if (priv->mouse_location == MOUSE_TROUGH && !(state & GTK_STATE_FLAG_INSENSITIVE))
     state |= GTK_STATE_FLAG_PRELIGHT;
 
@@ -2418,6 +2420,7 @@ range_grab_add (GtkRange      *range,
   priv->grab_location = location;
   gtk_range_queue_allocate_location (range, location);
 
+  update_trough_state (range);
   update_slider_state (range);
   update_steppers_state (range);
 
@@ -3473,6 +3476,7 @@ gtk_range_update_mouse_location (GtkRange *range)
       else
         gtk_widget_set_state_flags (widget, GTK_STATE_FLAG_PRELIGHT, FALSE);
 
+      update_trough_state (range);
       update_slider_state (range);
       update_steppers_state (range);
     }