* exwm-core.el (exwm--mwm-hints): Removed.
(exwm--mwm-hints-decorations): New buffer-local variable for
indicating whether the X window should have decorations.
* exwm-floating.el (exwm-floating--set-floating): Hide the mode-line
of undecorated floating X windows by default.
* exwm-manage.el (exwm-manage--update-mwm-hints):
Set exwm--mwm-hints-decorations;
(exwm-manage--manage-window): Manage an undecorated X window if its
input model is not 'No Input' or 'Globally Active'.
* exwm-floating.el (exwm-floating--exit):
* exwm-input.el (exwm-input--exit):
* exwm-layout.el (exwm-layout--exit):
* exwm-manage.el (exwm-manage--exit):
* exwm-randr.el (exwm-randr--exit):
* exwm-systemtray.el (exwm-systemtray--exit):
* exwm-workspace.el (exwm-workspace--exit):
New functions for cleanup each module.
* exwm-input.el (exwm-input--on-pre-command, exwm-input--on-post-command)
(exwm-input--init): Name lambda functions.
* exwm-layout.el (exwm-layout--timer, exwm-layout--init): Save timer.
* exwm-randr.el (exwm-randr-enable): Register the cleanup function.
* exwm-systemtray.el (exwm-systemtray--init): Force refresh atoms in XEMBED
and system tray protocols.
(exwm-systemtray-enable): Register the cleanup function.
* exwm-workspace.el (exwm-workspace--client): Save the server process.
(exwm-workspace--confirm-kill-emacs): Add emacsclient-specific
cleanup codes.
(exwm-workspace--timer): Save the timer.
(exwm-workspace--init): Save the server process and timer;
fix problems with emacsclient frames.
* exwm.el (exwm-init): Always select the newly created frame;
force refresh ICCCM & EWMH atoms.
(exwm-exit-hook): New hook for holding cleanup codes.
(exwm--exit): Run `exwm-exit-hook', execute cleanup codes for
each module and reset the environment.
Nix sometimes outputs a warning message like this:
```
directory /nix does not exist; creating it by running ‘?? using sudo
```
... when it really meant to output something that looked like this:
```
directory /nix does not exist; creating it by running 'mkdir -m 0755 /nix && chown gabriel /nix' using sudo
```
The reason why is due to some bizarre behavior in Bash where it will translate anything of the form `$x’` to `??`, leading to the incorrect warning message. I don't know what is the origin of this Bash behavior, but the easiest fix is to just use ASCII quotes instead of unicode quotes.
