bug#21718: 24.5; Backgrounding emacsclient hangs emacs

[Ed Avis <ed.avis@qmaw.com>]

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For me the whole emacs process (outer one) hangs.  Normal Emacs keystrokes like C-g have no effect and it doesn't update the screen (so pressing Enter adds a blank line and scrolls up the whole screen).  I have to kill(1) it.

Since you've also followed the recipe and not seen the same result, I will check again carefully that there isn't some hidden step or configuration that triggers it.  I was running under GNU screen, which might have affected it somehow.

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