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First, why is this here and not in libinput: drag lock should be implemented
in the compositor (not in libinput) so it can provide feedback when it
activates and grouped in with other accessibility features. That will work for
Wayland but in X the compositor cannot filter button events - only the server
and the drivers can.
This patch adds mostly the same functionality that evdev provides with two
options on how it works:
* a single button number configures the given button to lock the next button
pressed in a logically down state until a press+ release of that same button
again
* a set of button number pairs configures each button with the to-be-locked
logical button, i.e. a pair of "1 3" will hold 3 logically down after a
button 1 press
The property and the xorg.conf options take the same configuration as the
evdev driver (though the property has a different prefix, libinput instead of
Evdev).
The behavior difference to evdev is in how releases are handled, evdev sends
the release on the second button press event, this implementation sends the
release on the second release event.
https://bugs.freedesktop.org/show_bug.cgi?id=85577
Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
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