bug#22214: 25.0.50; lock up with gui dialogs and clipmon-mode

[Eli Zaretskii]

> From: Brian Burns <bburns.km@gmail.com>
> Date: Sun, 20 Dec 2015 18:21:24 -0600
> 
> Hi, clipmon author here - this seems to be a problem on Linux as the Windows
> build (25.0.50.1) works okay on Windows 8.1, but I read that
> `x-get-selection-value' is obsolete in Emacs 25, and was changed to
> `gui-get-primary-selection' -
> http://stackoverflow.com/questions/28403647/emacs-25-yank-from-x-windows-primary-clipboard-buffer-with-keyboard.

That shouldn't matter -- these are equivalent.

I'm guessing that GTK has something to do with this issue.

But in any case, calling x-get-selection-value from a timer that runs
every few seconds is not a very good idea.