pty issue causes 'screen' to hang when run from mintty as detached

[Matt D.]

See here for additional information and reproducible steps in the mintty 
support ticket:
https://code.google.com/p/mintty/issues/detail?id=390

I can reproduce this using cygwin 1.7.20, 1.7.19, 1.7.18, 1.7.15, and 1.7.7.

Screen does NOT hang when is is created by calling the first command 
through cygwin started by cygwin.bat (commands typed through Windows 
terminal 'cmd.exe' instead of mintty) and then attempting to attach 
through mintty with the second command.

Workaround is to use:

'cygstart --hide screen -S name -d -m'

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