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bug#19413: 24.4; (desktop-save-mode 1) save frame as page and desktop st

From: Oleksandr Gavenko
Subject: bug#19413: 24.4; (desktop-save-mode 1) save frame as page and desktop sticky (_NET_WM_STATE_STICKY) when close Emacs shaded, (setq desktop-restore-frames nil) fix issue.
Date: Sat, 20 Dec 2014 19:33:40 +0200
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/24.4 (gnu/linux)

On 2014-12-20, martin rudalics wrote:

>> When frame sticky (Fvwm decorate it especially) I get "t". For non-sticky I
>> get "nil".
> So the value of sticky corresponds to what you see on screen.  Correct?


> To get it right: You first close Emacs with a shaded frame and if you
> afterwards look at the desktop file it has (sticky) in it.  If you now
> restart Emacs and close it again, the desktop file has (sticky . t).


>> So there are two problems:
>>   1) Emacs instead saving shaded window attribute add "(sticky)" to 
>> ~/.emacs.desktop
> So if you do not have a desktop file initially but enable
> `desktop-save-mode' and then
> (1) close Emacs with a shaded frame, and
> (2) close Emacs with an unshaded frame
> the difference is a (sticky) entry for (1) and no such entry for (2).
> Is that correct?


>>   2) (desktop-read) wrongly apply (sticky), and (sticky . t) and (sticky . 
>> nil)
>>   - as always sticky.
> This sounds like a reasonable explanation.  x_net_wm_state has
> /**   store_frame_param (f, Qsticky, sticky ? Qt : Qnil); **/
> without any further comment, maybe it's related.  Does Emacs process
> (set-frame-parameter nil 'sticky ...)
> correctly on your system without desktop saving involved?

Any of:

  (set-frame-parameter nil 'sticky t)
  (set-frame-parameter nil 'sticky nil)
  (set-frame-parameter nil 'sticky 1)
  (set-frame-parameter nil 'sticky -1)

make clean "emacs -Q" sticky. Seems that issue here.

It is possible Fvwm bug but I don't know how to distinct. In FvwmConsole I

  WindowId 0x2400013 Stick false
  WindowId 0x2400013 Stick true

and Emacs window change stickness exactly to command.

>> I check /src/xterm.h:
>>    /* Atoms dealing with EWMH (i.e. _NET_...) */
>>    Atom Xatom_net_wm_state, Xatom_net_wm_state_fullscreen,
>>      Xatom_net_wm_state_maximized_horz, Xatom_net_wm_state_maximized_vert,
>>      Xatom_net_wm_state_sticky, Xatom_net_wm_state_hidden,
>>      Xatom_net_frame_extents,
>>      Xatom_net_current_desktop, Xatom_net_workarea;
>> There are no _NET_WM_STATE_SHADED that defined in:
>> http://standards.freedesktop.org/wm-spec/wm-spec-1.3.html#idm140130317598336
>>      _NET_WM_STATE
>> which say:
>>    Possible atoms are:
> We have to possibilities to deal with these: Either we wait for Jan to
> return from his voyage or you fix these issues yourself.  Given your
> findings above I'm quite confident that you could do it.

xterm.c and elisp frame handling code are complicate to me.

I just can summarise investigation: 

 * (set-frame-parameter nil 'sticky ...) doesn't work, it always set
   _NET_WM_STATE(ATOM) to _NET_WM_STATE_STICKY regardless passed value.

 * Emacs code base know nothing about _NET_WM_STATE_SHADED value of

 * There are no "shaded" (info "(elisp)Window Frame Parameters"). I see:
   ‘sticky’, ‘visibility’, ‘fullscreen’ (maximized, fullboth, fullwidth,

 * Closing shaded Emacs with "(desktop-save-mode 1)" add (stick) parameter to

Best regards!

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