[Bug mi/29002] Console input broken in MI mode

["eliz at gnu dot org" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=29002

--- Comment #10 from Eli Zaretskii <eliz at gnu dot org> ---
(In reply to hmb from comment #8)
> I'm still encountering an error with the latest 13.2 release of GDB on a
> Windows host. When using GDB, I'm not receiving responses for the MI
> commands, causing my IDE (Eclipse) to freeze and become unresponsive.
> 
> To reproduce the issue, I have the following scenario in PowerShell:
> 
> $  cat input
> 1-list-thread-groups
> 2-list-thread-groups
> 3-list-thread-groups
> 
> cat input | arm-none-eabi-gdb.exe --silent --interpreter=mi2
> =thread-group-added,id="i1"
> (gdb)
> 1^done,groups=[{id="i1",type="process"}]
> (gdb)
> &"warning: Exception condition detected on fd 0\n"
> &"error detected on stdin\n"
> 
> 
> 
> As observed, there is no response for the MI commands numbered 2 and 3."

I cannot reproduce this with GDB 13.1 I built myself with mingw.org's MinGW. 
For the same input, but using the native MS-Windows GDB, I get this:

d:\usr>cat gdb.input | gdb  --silent --interpreter=mi2
=thread-group-added,id="i1"
(gdb)
1^done,groups=[{id="i1",type="process"}]
(gdb)
2^done,groups=[{id="i1",type="process"}]
(gdb)
3^done,groups=[{id="i1",type="process"}]
(gdb)
&"warning: Exception condition detected on fd 0\n"
&"error detected on stdin\n"

So all the 3 commands were processed.

In case it's important, I ran this command from cmd.exe, not from PowerShell.

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