swipeTracker: Flip pan gesture velocity in RTL locales

Like the gesture delta, the final velocity needs to be flipped in
RTL locales, otherwise we end up cancelling out the gesture progress.

Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/3967>

diff --git a/js/ui/swipeTracker.js b/js/ui/swipeTracker.js
index 30afdef7b1dd9c7f940f8cfbf6608d4795acd670..45b23bfaea2eba99721e0e384f3f1d39ca75ae0f 100644 (file)
--- a/js/ui/swipeTracker.js
+++ b/js/ui/swipeTracker.js
@@ -653,8 +653,8 @@ export const SwipeTracker = GObject.registerClass({
     _endPanGesture(panGesture) {
         const velocity = panGesture.get_velocity();
         const v = this.orientation === Clutter.Orientation.HORIZONTAL
-            ? -velocity.get_x()
-            : -velocity.get_y();
+            ? this._getGestureDirFactor() * velocity.get_x()
+            : this._getGestureDirFactor() * velocity.get_y();
 
         this._endGesture(v, this._distance, false);
     }
@@ -679,6 +679,14 @@ export const SwipeTracker = GObject.registerClass({
         this._endGesture(0, this._distance, false);
     }
 
+    _getGestureDirFactor() {
+        if (this.orientation === Clutter.Orientation.HORIZONTAL &&
+            Clutter.get_default_text_direction() === Clutter.TextDirection.RTL)
+            return 1;
+
+        return -1;
+    }
+
     /**
      * Confirms a swipe. User has to call this in 'begin' signal handler,
      * otherwise the swipe wouldn't start. If there's an animation running,