check null in toplevel_from_popup

managed to SEGFAULT the server by trying to create a popup
without setting a parent first.

Not sure if this is dwl or wlroots issue, so also opened a ticket upstream: https://gitlab.freedesktop.org/wlroots/wlroots/-/merge_requests/3811

allow unmanaged clients (like dzen or dmenu) to have keyboard focus

correctly handle cursor motion when button is held (for layer surfaces)

remove unused variables

new function to notify keyboard enter

sort client.h functions

set monitor for clients that don't have one in updatemons()

only if selmon is enabled and the clients are mapped

handle client_from_wlr_surface() receiving a subsurface

always set the same monitor and tags for child clients of a client

fixes #272

remove a useless check

if `s->role_data == NULL`, wlr_*_surface_from_wlr_surface() will return NULL
and we are checking it

respect size hints

unconstrain layer shell popups

also unconstrain popups from monitor's usable area

move ugglyness to client.h

improve client_from_wlr_surface()

add a new function to get a client from a wlr_surface

Check if XWayland client size_hints are NULL

fix segfault when dragging chromium tabs

add missing return in client_is_floating_type()

This causes all Xwayland clients to be treated as floating

improve floating detection

mostly copied from sway

Merge pull request #204 from djpohly/scenegraph3

merge scenegraph3