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bug#30421: 25.3; desktop.el: Steal lock when no living "emacs" process o


From: Pierre Neidhardt
Subject: bug#30421: 25.3; desktop.el: Steal lock when no living "emacs" process owns it
Date: Fri, 16 Feb 2018 23:58:52 +0100
User-agent: mu4e 1.0; emacs 26.0.91

I tried patching with

                       -(daemonp)
                       +(and (daemonp) (= (length (visible-frame-list)) 1))

Then I killed the daemon, leaving a .lock behind.
On restart:

- In a tty, I get a black screen with a blinking cursor on the bottom left
corner.
If I press 'y', it proceeds with loading the desktop file.  I can verify
that from the *Messages* buffer.

- With EXWM, I get a black screen, but 'y' does not work.  So it's
effectively stuck.

I'm thinking that maybe `after-make-frame-functions' are run too early,
before the frame is fully ready.

Then I re-considered Eli's last remark: the daemon already has a frame, so I
thought maybe we should also guard the hook with a check on the frames count:

        (defun ambrevar/desktop-init (_frame)
            (when (> (length (visible-frame-list)) 1)
              (desktop-save-mode)
              (desktop-read)
              (remove-hook 'after-make-frame-functions 'ambrevar/desktop-init)))

That did not change anything.

Any clue?

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