Hi list and Bram.

Continue from reported problem: 
https://groups.google.com/d/msg/vim_dev/G9KD895VTxw/ch5R5nqDBQAJ


Problem:

After 7.4.851, on Windows7, when using vim.exe with msys or msys2,
conhost.exe (console window provider on Windows7) will freeze or crash.
It can be reproduced by this like basic commands.

    :r!cat somefile.txt

("cat" should be part of msys or msys2)
When executing this, vim looks like freeeze or crash.

I don't know the root cause of this, but I have discovered that
those host (conhost.exe) freezes or crashes
when execute a program of msys or msys2 from vim,
under the condition of vim's own screen buffer is active,


Solution:

Make original screen buffer active,
before executing external program on Windows 7.
And when the program is finished, revert to vim's one.


Patch: https://gist.github.com/koron/4cabff43767bca269792

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