[gnome-shell] st/button: Notify :pressed changes

[Florian Müllner <fmuellner src gnome org>]

commit 9790b0ee5d23f5d8a44a1733fb9d5fbd50a7f41d
Author: Florian Müllner <fmuellner gnome org>
Date:   Fri Nov 22 18:53:26 2019 +0100

    st/button: Notify :pressed changes
    
    https://gitlab.gnome.org/GNOME/gnome-shell/merge_requests/846

 src/st/st-button.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)
---
diff --git a/src/st/st-button.c b/src/st/st-button.c
index c1ea7b9915..c2c48a5101 100644
--- a/src/st/st-button.c
+++ b/src/st/st-button.c
@@ -139,13 +139,17 @@ st_button_press (StButton             *button,
                  ClutterEventSequence *sequence)
 {
   StButtonPrivate *priv = st_button_get_instance_private (button);
+  gboolean active_changed = priv->pressed == 0 || sequence;
 
-  if (priv->pressed == 0 || sequence)
+  if (active_changed)
     st_widget_add_style_pseudo_class (ST_WIDGET (button), "active");
 
   priv->pressed |= mask;
   priv->press_sequence = sequence;
   priv->device = device;
+
+  if (active_changed)
+    g_object_notify_by_pspec (G_OBJECT (button), props[PROP_PRESSED]);
 }
 
 static void
@@ -171,6 +175,7 @@ st_button_release (StButton             *button,
   priv->press_sequence = NULL;
   priv->device = NULL;
   st_widget_remove_style_pseudo_class (ST_WIDGET (button), "active");
+  g_object_notify_by_pspec (G_OBJECT (button), props[PROP_PRESSED]);
 
   if (clicked_button || sequence)
     {