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Date:	Tue, 3 May 2022 07:19:44 +0200
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Subject:	Re: mintty phantom key presses
To:	cygwin AT cygwin DOT com
References:	<CAA=0bEORh1+OiRZOWz5HVYCfDUM8kjF54EXeWvtnYsCij6vfBA AT mail DOT gmail DOT com>
From:	Thomas Wolff <towo AT towo DOT net>
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Am 02.05.2022 um 23:54 schrieb Eric Adams:
> Hi,
>
> I had previously reported this issue as "Possible phantom control-key state..."
>
> I observe that moving between cygwin mintty windows and Windows
> windows causes unexpected behavior in the cygwin world.
>
> I took a new approach, using vi :) . In cygwin, I open a new file,
> enter insert mode, hit Ctrl-V, and mouse out of the window. When I
> mouse back into the cygwin edit window, my screen contains the display
> string "^[[O" (note that the "^[" is vi-speak for "esc"). Examining
> the resulting file with od shows:
>> od -ah fdsa
> 0000000 esc   [   O  nl
>                 5b1b    0a4f
>
> Here, the nl character is inserted by vi.
>
> This smells like an incomplete escape sequence. If it's left at the
> command line, just waiting for the user to type something, there might
> be trouble.
>
> Am I completely off?
> Thanks,
> Eric Adams.
CSI O is the focus off notification (CSI I is the focus in notification).
Someone has switched on focus reporting mode (CSI ? 1004 h) in your 
session (and isn't catching the notifications).
Run your application in a fresh mintty, with no other software, to test.
Thomas

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