swipeTracker: Reset scroll gesture state on disabling

Ensure that scrolling works correctly next time it's enabled.

https://gitlab.gnome.org/GNOME/gnome-shell/issues/2177

diff --git a/js/ui/swipeTracker.js b/js/ui/swipeTracker.js
index 65c3d0d649999703e9bacf01d3168e9da0d88441..77536e47666ac37d7bbf7fe65cb53356725493c2 100644 (file)
--- a/js/ui/swipeTracker.js
+++ b/js/ui/swipeTracker.js
@@ -270,6 +270,8 @@ const ScrollGesture = GObject.registerClass({
             return;
 
         this._enabled = enabled;
+        this._began = false;
+
         this.notify('enabled');
     }