implement the virtual pointer protocol

This is used by programs like warpd.

do not arrange monitor if it's disabled (wlroots!4520)

This causes us to send negative values to xdg-configures (e.g a bug in our end)

References: https://gitlab.freedesktop.org/wlroots/wlroots/-/merge_requests/4520
(cherry picked from commit 4043fc3093a73174cb63653ba9e742b4738f2ee5)

No need to call updatemons ourselves

The output manager in wlroots emits an output_layout.change event when
anything changes, so updatemons will be called anyway.

ΔSLOC: -1

drop unused variable

turn on -Wfloat-conversion

turn on -Wsign-compare

check if monitor is null before setting gamma

fixes segfault on monitor disconnect when using wlsunset

Destroy fullscreen node after moving clients off mon

fix posible NULL-dereference in wl_surface.commit handler

unset DISPLAY before setting up xwayland

only execute the first keybinding

more style fixes

missed from the previous iteration

create a wlr_keyboard_group for virtual keyboards

Fixes: https://codeberg.org/dwl/dwl/issues/554

fix typo

Fixes: 7afdc191fe4e9b3d16604b7f0c96f9741247e2d2
Thanks to: David Donahue <david.donahue2996@gmail.com>

tie xdg_toplevel_decorations to Client

a xdg_toplevel can only have one xdg_toplevel_decoration so there is no need to
have a new struct for decorations

Revert "nuke CSDs, hopefully for good!"

The compositor must respond to the client requesting a change to the decoration
mode, it does not matter if the compositor chooses a different mode.

This reverts commit 9071ce6c848ce214939fb84f85ae77de86de88d7.

Revert "remove typedef `Decoration`"

This reverts commit d1ff1e6f75d9c53c953957b5c0a64e0bcb40008b.

style fixes

use wlr_keyboard_group to manage all keyboards

check toplevel resources

it's just a aesthetic change