mutter-clutter is a private library that is only used by the shell and
not meant to be ABI/API compatible in between versions, so there's no
need to add padding to classes.
Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/2903>
By default, the pan action performs matrix translations on the
child widget. Nobody wants that (or, nobody wants *just* that).
It's cleaner not to mix mechanism and effect in ClutterGestureAction
subclasses, so drop this base implementation, and change the signal
accumulator so it's more similar to event signals (not that it's
used any longer, anyway).
Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/2024>
