[gnome-shell] st/button: Add the clicked button to virtual function signature

[Florian Müllner <fmuellner src gnome org>]

commit 320df13b651d03d20688d645963a114e3936a3a3
Author: Marco Trevisan (Treviño) <mail 3v1n0 net>
Date:   Tue Oct 15 21:13:59 2019 +0200

    st/button: Add the clicked button to virtual function signature
    
    clicked signal includes a clicked mouse button parameter, but the vfunc
    signature doesn't include it, so it won't be passed to the functions when
    the signal is emitted.
    
    https://gitlab.gnome.org/GNOME/gnome-shell/merge_requests/559

 src/st/st-button.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/src/st/st-button.h b/src/st/st-button.h
index 5ee45896e1..df0d1ea0c5 100644
--- a/src/st/st-button.h
+++ b/src/st/st-button.h
@@ -40,7 +40,7 @@ struct _StButtonClass
   void (* transition) (StButton     *button);
 
   /* signals */
-  void (* clicked) (StButton *button);
+  void (* clicked) (StButton *button, int clicked_button);
 };
 
 StWidget    *st_button_new             (void);