Currently we send the first configure for xdg popups before the popup
has made its initial commit. This is incorrect according to the protocol
and may confuse clients.
This replaces the old View.fromWlrSurface function and is more general.
This commit also moves the xdg activation request_activate listener to
Server as it has no reason to be in View.
We currently don't properly handle xdg surface geometry of the parent,
which causes popups to render partially off-screen in some cases.
GTK4 clients such as easyeffects seem to trigger this issue reliably.
When an xdg toplevel, layer surface, etc is destroyed, it is not
guaranteed that all the children in the surface tree have already been
destroyed. If there are still children around, destroying the root of
the tree would leave dangling pointers.
To fix this, destroy all children when destroying any node in the tree.
river is not a library and passing a general purpose allocators around
everywhere does not make sense and leads to ugly code. This does not
prevent us from using local arenas if they are fitting.
