Re: Small regression on Windows

[Jeff Hostetler <git@jeffhostetler.com>]

On 2/13/2017 1:00 PM, Johannes Sixt wrote:
> Please type this, preferably outside of any repo to avoid that it is 
> changed; note the command typo:
>
>    git -c help.autocorrect=40 ceckout
>
> Git waits for 4 seconds, but does not write anything until just before 
> it exits. It bisects to
>
> a9b8a09c3c30886c79133da9f48ef9f98c21c3b2 is the first bad commit
> commit a9b8a09c3c30886c79133da9f48ef9f98c21c3b2
> Author: Jeff Hostetler <jeffhost@microsoft.com>
> Date:   Thu Dec 22 18:09:23 2016 +0100
>
>     mingw: replace isatty() hack
>
>     Git for Windows has carried a patch that depended on internals
>     of MSVC runtime, but it does not work correctly with recent MSVC
>     runtime. A replacement was written originally for compiling
>     with VC++. The patch in this message is a backport of that
>     replacement, and it also fixes the previous attempt to make
>     isatty() tell that /dev/null is *not* an interactive terminal.
>
>     Signed-off-by: Jeff Hostetler <jeffhost@microsoft.com>
>     Tested-by: Beat Bolli <dev+git@drbeat.li>
>     Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
>     Signed-off-by: Junio C Hamano <gitster@pobox.com>
>
> :040000 040000 bc3c75bdfc766fe478e160a9452c31bfef50b505 
> f7183c3a0726fef7161d5f9ff8c997260025f1bb M      compat
>
> Any ideas? I haven't had time to dig any further.

I'm investigating now.

The warning text is being written to stderr and then main thread sleeps 
for the 4 seconds.
However, stderr has been redirected to the pipe connected to the 
console_thread that
handles the coloring/pager.  It is in a blocking ReadFile on the pipe 
and is thus stuck until
the main thread runs the corrected command and closes the pipe.  It then 
sees the EOF
and prints everything in the pipe buffer.

I'll look into fixing this now.

Jeff