aaf6c88226
libinput 1.27 added a new "sticky" mode to the tap-and-drag drag lock -
the previous mode is now called the "timeout" mode.
In sticky mode the drag lock is explicitly terminated with an extra tap,
i.e. a full sequence is:
tap, down, [:move, up, wait, down:], up, tap
where the middle part can repeat and/or wait as long as required.
In the previous "timeout" mode the drag lock would automatically release
after a timeout - for users with low dexterity this timeout may be too
short.
The sticky mode is also how macos does drag lock.
Related: https://gitlab.gnome.org/GNOME/gnome-control-center/-/merge_requests/2798
Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/4292>