Add hold gestures to Linux Wayland

[elcste]

Problem description

Build 4180 added kinetic scrolling for Linux under Wayland. This is great but like most Linux kinetic scrolling until recently, it is missing hold gestures. A hold gesture is touching two fingers down on the touchpad to stop that kinetic scroll "fling" motion.

MacOS has had this feature since they implemented kinetic scrolling, copying touchscreens. For whatever reason, the Linux stack (Libinput, GTK) didn't include hold gesture support until more recently. Libinput now has support but GTK only added support with GTK 4.

Preferred solution

Firefox, which like Sublime Texts uses some GTK and is using GTK 3 had wanted to include hold gestures. Firefox devs created a patch but the GTK devs say they won't add new features to GTK 3. But Firefox devs then managed to implement hold gestures in Firefox without GTK 3 support (see Firefox bug 1568722) and this was released in version 134.

I know enough to know that I don't know 😉 if Sublime Text uses GTK similarly to Firefox, but maybe their work can be useful for the ST devs.

Alternatives

Port to GTK4? 😱

Additional Information

No response