From: martin rudalics <rudalics@gmx.at>
To: Markus Triska <triska@metalevel.at>
Cc: 52666@debbugs.gnu.org
Subject: bug#52666: 27.0.50; Unexpected mode line flickering when creating frames
Date: Wed, 22 Dec 2021 10:22:57 +0100 [thread overview]
Message-ID: <1557a1b7-f634-3add-5dde-6326b0b74328@gmx.at> (raw)
In-Reply-To: <87o859vgas.fsf@metalevel.at>
> I also noticed this: When the mouse is in the area where the new frame
> arises, then the new frame is selected on all platforms I tried.
Are you sure that the new frame is _not_ selected when the mouse is _not_
in that area?
> I have
> set focus-follows-mouse to nil (the default). Ideally, I would like the
> existing frame to reliably retain the focus, and the new frame to not be
> selected when it is created. Is there any way to reliably ensure this?
Not in my experience. Conceptually, it should be possible by setting
the 'no-focus-on-map' or temporarily (that is until the frame has become
visible) the 'no-accept-focus' window parameter but I haven't yet seen a
WM strictly adhering to that discipline. It worked best on Windows XP.
>> corner of the parent's native frame. Since the size of the child frame
>> is by default that of its parent, the child frame will thus draw over
>> the entire area of the parent frame (including mode line and scroll
>
> I think this is the part that can be counterintuitive, since the Elisp
> documentation states:
>
> 39.2 Forcing Redisplay
> ======================
>
> Emacs normally tries to redisplay the screen whenever it waits for
> input.
>
> In the example that exhibits the flickering, there is no waiting for
> input between the creation of the frame and the change of its width and
> height.
Maybe that line is confusing. Emacs may have to redisplay whenever it
receives a corresponding event (like Map, Visibility, Expose and Focus
notifications). Waiting for user input is only a tangential aspect
there. What that chapter tries to describe is that an application can
try to force additional redisplays by using the means described there.
Inhibiting redisplay (via setting 'inhibit-redisplay') is in general not
supported and might have no effect either.
> Therefore, it is unexpected that the frame is drawn over the
> entire area of the parent frame. I expected it to be drawn only for the
> area it is configured, when Emacs waits for input.
Emacs does not necessarily "wait for input" in that case. Depending on
the underlying windowing system it might rather wait for a MapNotify or
ConfigureNotify event.
martin
next prev parent reply other threads:[~2021-12-22 9:22 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-12-19 20:42 bug#52666: 27.0.50; Unexpected mode line flickering when creating frames Markus Triska
2021-12-20 9:18 ` martin rudalics
2021-12-20 15:11 ` Eli Zaretskii
2021-12-20 17:21 ` martin rudalics
2021-12-20 18:23 ` Markus Triska
2021-12-20 18:30 ` martin rudalics
2021-12-20 18:41 ` Markus Triska
2021-12-21 10:32 ` martin rudalics
2021-12-21 20:44 ` Markus Triska
2021-12-22 9:22 ` martin rudalics [this message]
2021-12-22 13:37 ` Eli Zaretskii
2021-12-22 16:33 ` Markus Triska
2021-12-23 14:46 ` martin rudalics
2021-12-23 16:23 ` Markus Triska
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