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Date:	Tue, 3 May 2022 13:53:31 +0200
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Subject:	Re: mintty phantom key presses
To:	Eric Adams <ericbadams AT gmail DOT com>
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From:	Thomas Wolff <towo AT towo DOT net>
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Am 03/05/2022 um 13:50 schrieb Eric Adams:
> On Tue, May 3, 2022 at 12:20 AM Thomas Wolff <towo AT towo DOT net> wrote:
>> 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
>>
> Thomas,
> Thank you for your insight. I'm afraid I don't know how to test this
> without some extra software involved.
>
> In a fresh mintty, I tried "cat - > capturefile", focussed in and out
> of the window a few times and hit Ctrl-D. The capturefile was empty.
>
> In a new mintty window, I try the vi experiment, and the escape
> sequence is captured.
>
> Suggestions?
>
> Thank you,
> Eric Adams.
Which system do you run? (cygwin, msys)
Is that cygwin vi? (What does `type vi` say?)
What are your bash/vi configuration files?

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