[polari] Replace Gtk.get_current_event()

[Marge Bot <marge-bot src gnome org>]

commit 1c5ce3f96c7b57537505e5289a607b2d687a9396
Author: Florian Müllner <fmuellner gnome org>
Date:   Tue Aug 24 18:23:06 2021 +0200

    Replace Gtk.get_current_event()
    
    In GTK4, events can only be retrieved from a controller, not
    globally.
    
    Part-of: <https://gitlab.gnome.org/GNOME/polari/-/merge_requests/228>

 src/chatView.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/src/chatView.js b/src/chatView.js
index 2157649b..f87b1da6 100644
--- a/src/chatView.js
+++ b/src/chatView.js
@@ -879,7 +879,7 @@ export default GObject.registerClass({
     }
 
     _handleButtonTagPressed(gesture, nPress, ...coords) {
-        const event = Gtk.get_current_event();
+        const event = gesture.get_current_event();
 
         if (nPress > 1 || !event.triggers_context_menu())
             return;