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>
(cherry picked from commit 799a842d3a11b9d0df0e69d2d6a07ce66f926ba2)

diff --git a/js/ui/swipeTracker.js b/js/ui/swipeTracker.js
index 18f6657db18b39d56488b5bab97e3e51e6b9d51d..16138622b9c566f16674b98c47da899eec990eb1 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,