bug#57434: 28.1.91; Terminal Emacs Mac OS flickering.

[Dmitrii Kuragin via "Bug reports for GNU Emacs, the Swiss army knife of text editors" <bug-gnu-emacs@gnu.org>]

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If everyone is OK with adding a new frame-local elisp flag, then I can
prepare a patch.

On Thu, Sep 8, 2022 at 8:59 AM Dmitrii Kuragin <kuragin@google.com> wrote:

> I agree with Gerd on the discoveries.
>
> Here's some code how tmux works with that [1], we can probably avoid it by
> providing a frame-local flag which enables the functionality, so that
> multiple emacs clients might be connected from potentially different
> terminals.
>
> We can improve the default value of the flag based on terminal
> capabilities later once we have confidence in the way it works and probably
> extend it to support different specifications of syncing.
>
> [1]:
> https://github.com/tmux/tmux/blob/9c34aad21c0837123a51a5a4233a016805d3e526/tty-features.c#L474
>
> On Thu, Sep 8, 2022 at 2:35 AM Gerd Möllmann <gerd.moellmann@gmail.com>
> wrote:
>
>> Eli Zaretskii <eliz@gnu.org> writes:
>>
>> > I guess by P1 you mean these two sequences:
>> >
>> >   BSU: ESC P = 1 s ESC \
>> >   ESU: ESC P = 2 s ESC \
>> >
>> > whereas by P2 you mean these:
>> >
>> >   DECRQM: ESC [ ? 2026 $ p
>> >   DECRPM: ESC [ ? 2026 ; n $ y  (with n = 0..4, and 0 or 4 means "no
>> support")
>> >   BSU:    ESC [ ? 2026 h
>> >   ESU:    ESC [ ? 2026 l
>>
>> Yes, that looks like them.
>>
>> >
>> >> > Do you happen to know where is the definitive documentation of Sync?
>> >>
>> >> Sorry, I don't know a definitive documentation.
>> >
>> > And any documentation at all?
>>
>> Not even that.  I tried to find something today, but nothing useful
>> turned up.
>>
>> >
>> > Anyway, given the problems usually related to querying terminals about
>> > potentially unsupported features, and the general mess in this field,
>> > I think our best bet is to have a function that could switch the
>> > frame-update hooks between these 3 states:
>> >
>> >   . unused
>> >   . used with P1 BSU/ESU sequences
>> >   . used with P2 BSU/ESU sequences
>> >
>> > WDYT?
>>
>> Yes, something like that, I guess.
>>
>
>
> --
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> flexibility
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> .  Evening and weekend emails are a sign I allocated some regular working
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>
>

-- 
*If you get an email from me outside of the 9-5 it is *not* because I'm
always on or expect an immediate response from you; it is because of work
flexibility
<http://www.inc.com/john-boitnott/how-flexible-hours-can-create-a-better-work-life-balance.html>
.  Evening and weekend emails are a sign I allocated some regular working
hours for other things (such as family, gym, friends,...).  And I encourage
you to feel free to do the same.

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