Patch to re-enable kinetic scrolling on non-touchscreen input sources in GTK+ 3.20.

0001-Don-t-restrict-movement-gestures-to-touchscreens.patch

From c76461960d05b3d64185d1a67096461ce6854009 Mon Sep 17 00:00:00 2001
From: Craig Cabrey <craigcabrey@gmail.com>
Date: Fri, 8 Jul 2016 13:07:26 -0400
Subject: [PATCH] Don't restrict movement gestures to touchscreens

---
 gtk/gtkscrolledwindow.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/gtk/gtkscrolledwindow.c b/gtk/gtkscrolledwindow.c
index 1b52082..dc30ade 100644
--- a/gtk/gtkscrolledwindow.c
+++ b/gtk/gtkscrolledwindow.c
@@ -2042,7 +2042,7 @@ gtk_scrolled_window_init (GtkScrolledWindow *scrolled_window)
   priv->overlay_scrolling = TRUE;
 
   priv->drag_gesture = gtk_gesture_drag_new (widget);
-  gtk_gesture_single_set_touch_only (GTK_GESTURE_SINGLE (priv->drag_gesture), TRUE);
+  gtk_gesture_single_set_button (GTK_GESTURE_SINGLE (priv->drag_gesture), TRUE);
   g_signal_connect_swapped (priv->drag_gesture, "drag-begin",
                             G_CALLBACK (scrolled_window_drag_begin_cb),
                             scrolled_window);
@@ -2055,17 +2055,17 @@ gtk_scrolled_window_init (GtkScrolledWindow *scrolled_window)
 
   priv->pan_gesture = gtk_gesture_pan_new (widget, GTK_ORIENTATION_VERTICAL);
   gtk_gesture_group (priv->pan_gesture, priv->drag_gesture);
-  gtk_gesture_single_set_touch_only (GTK_GESTURE_SINGLE (priv->pan_gesture), TRUE);
+  gtk_gesture_single_set_button (GTK_GESTURE_SINGLE (priv->pan_gesture), TRUE);
 
   priv->swipe_gesture = gtk_gesture_swipe_new (widget);
   gtk_gesture_group (priv->swipe_gesture, priv->drag_gesture);
-  gtk_gesture_single_set_touch_only (GTK_GESTURE_SINGLE (priv->swipe_gesture), TRUE);
+  gtk_gesture_single_set_button (GTK_GESTURE_SINGLE (priv->swipe_gesture), TRUE);
   g_signal_connect_swapped (priv->swipe_gesture, "swipe",
                             G_CALLBACK (scrolled_window_swipe_cb),
                             scrolled_window);
   priv->long_press_gesture = gtk_gesture_long_press_new (widget);
   gtk_gesture_group (priv->long_press_gesture, priv->drag_gesture);
-  gtk_gesture_single_set_touch_only (GTK_GESTURE_SINGLE (priv->long_press_gesture), TRUE);
+  gtk_gesture_single_set_button (GTK_GESTURE_SINGLE (priv->long_press_gesture), TRUE);
   g_signal_connect_swapped (priv->long_press_gesture, "pressed",
                             G_CALLBACK (scrolled_window_long_press_cb),
                             scrolled_window);
-- 
2.9.0

README.md

Kinetic Scrolling

e3a281be135337924f50c829bf418895f64e978f disabled kinetic scrolling if the input source wasn't from a touchscreen (GDK_SOURCE_TOUCHSCREEN).

This patch re-enables that functionality. libinput does not mimic kinetic scrolling (for good reason), so it is up to the toolkit to implement the feature.

Usage

1. Download 0001-Don-t-restrict-movement-gestures-to-touchscreens.patch.
2. Clone the GTK repository: git clone git://git.gnome.org/gtk+ && cd gtk+.
3. Checkout the 3.20 branch: git checkout -b 3_20 origin/gtk-3-20.
4. Apply the patch: git apply ../0001-Don-t-restrict-movement-gestures-to-touchscreens.patch.
5. Build GTK and install.

I run Arch so I downloaded the PKGBUILD and modified it to include the patch.

I can use this for gnome 3.34 as well right? and 5th step is to run make && sudo make install from inside build folder right? I badly need this feature since I depend on touchpad & it's a pain without kinetic scroll