From: Carlos Garnacho <carlosg@gnome.org>
Date: Mon, 28 Feb 2022 19:27:43 +0000 (+0100)
Subject: gtkscrolledwindow: Do not try to doubly trigger deceleration
X-Git-Tag: archive/raspbian/4.6.5+ds-1+rpi1~1^2~19^2~3^2~25
X-Git-Url: https://dgit.raspbian.org/?a=commitdiff_plain;h=3764b27babc1cf94f27dfe2079426846d53d0256;p=gtk4.git

gtkscrolledwindow: Do not try to doubly trigger deceleration

This may come from different sources at around the same time, e.g.
a hold gesture while on overshoot. Avoid doing that if an
animation is already set.

Fixes: https://gitlab.gnome.org/GNOME/gtk/-/issues/4730
---

diff --git a/gtk/gtkscrolledwindow.c b/gtk/gtkscrolledwindow.c
index 49be97080c..ee8c2b0ba4 100644
--- a/gtk/gtkscrolledwindow.c
+++ b/gtk/gtkscrolledwindow.c
@@ -1052,7 +1052,8 @@ gtk_scrolled_window_decelerate (GtkScrolledWindow *scrolled_window,
 
   if (priv->x_velocity != 0 || priv->y_velocity != 0 || overshoot)
     {
-      gtk_scrolled_window_start_deceleration (scrolled_window);
+      if (priv->deceleration_id == 0)
+        gtk_scrolled_window_start_deceleration (scrolled_window);
       priv->x_velocity = priv->y_velocity = 0;
     }
 }