[gnome-shell/wip/exalm/swipe-unaccel] swipeTracker: Use unaccelerated deltas

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

commit b156cabdc9acbb62a93abce2cf4dc9b081c995b5
Author: Alexander Mikhaylenko <exalm7659 gmail com>
Date:   Sun Feb 28 18:59:31 2021 +0500

    swipeTracker: Use unaccelerated deltas
    
    Unaccelerated deltas make sure the gesture works the same regardless of how
    fast the fingers move; this is what we were already doing for scrolling.
    
    Remove the swipe multiplier as the deltas already match scrolling other than
    the 1/10 multiplier Clutter applies to scrolling specifically.
    
    Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/1763>

 js/ui/swipeTracker.js | 9 ++++-----
 1 file changed, 4 insertions(+), 5 deletions(-)
---
diff --git a/js/ui/swipeTracker.js b/js/ui/swipeTracker.js
index f5f4dbb800..4546b76b61 100644
--- a/js/ui/swipeTracker.js
+++ b/js/ui/swipeTracker.js
@@ -16,7 +16,6 @@ const TOUCHPAD_BASE_WIDTH = 400;
 const EVENT_HISTORY_THRESHOLD_MS = 150;
 
 const SCROLL_MULTIPLIER = 10;
-const SWIPE_MULTIPLIER = 0.5;
 
 const MIN_ANIMATION_DURATION = 100;
 const MAX_ANIMATION_DURATION = 400;
@@ -139,7 +138,7 @@ const TouchpadSwipeGesture = GObject.registerClass({
         let time = event.get_time();
 
         const [x, y] = event.get_coords();
-        let [dx, dy] = event.get_gesture_motion_delta();
+        const [dx, dy] = event.get_gesture_motion_delta_unaccelerated();
 
         if (this._state === TouchpadState.NONE) {
             if (dx === 0 && dy === 0)
@@ -151,8 +150,8 @@ const TouchpadSwipeGesture = GObject.registerClass({
         }
 
         if (this._state === TouchpadState.PENDING) {
-            this._cumulativeX += dx * SWIPE_MULTIPLIER;
-            this._cumulativeY += dy * SWIPE_MULTIPLIER;
+            this._cumulativeX += dx;
+            this._cumulativeY += dy;
 
             const cdx = this._cumulativeX;
             const cdy = this._cumulativeY;
@@ -179,7 +178,7 @@ const TouchpadSwipeGesture = GObject.registerClass({
         }
 
         const vertical = this.orientation === Clutter.Orientation.VERTICAL;
-        let delta = (vertical ? dy : dx) * SWIPE_MULTIPLIER;
+        let delta = vertical ? dy : dx;
         const distance = vertical ? TOUCHPAD_BASE_HEIGHT : TOUCHPAD_BASE_WIDTH;
 
         switch (event.get_gesture_phase()) {