GNU bug report logs - #53001
29.0.50; xwidget-webkit: no mouseover text on pgtk

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Package: emacs; Severity: minor; Reported by: akira@HIDDEN; dated Tue, 4 Jan 2022 04:43:02 UTC; Maintainer for emacs is bug-gnu-emacs@HIDDEN.
Severity set to 'minor' from 'normal' Request was from Lars Ingebrigtsen <larsi@HIDDEN> to control <at> debbugs.gnu.org. Full text available.

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From: Po Lu <luangruo@HIDDEN>
To: Akira Kyle <akira@HIDDEN>
Subject: Re: bug#53001: 29.0.50; xwidget-webkit: no mouseover text on pgtk
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Akira Kyle <akira@HIDDEN> writes:

> Oh right, sorry for the confusion. It's when running under wayland so
> the value of (pgtk-backend-display-class) is "GdkWaylandDisplay"

Thanks, I see your problem here as well.
I will look into it.




Information forwarded to bug-gnu-emacs@HIDDEN:
bug#53001; Package emacs. Full text available.

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Subject: Re: bug#53001: 29.0.50; xwidget-webkit: no mouseover text on pgtk
To: Po Lu <luangruo@HIDDEN>
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On Tue, Jan 4, 2022 at 12:22 AM Po Lu <luangruo@HIDDEN> wrote:
>
> > This issue is only on emacs --with-pgt. The mousover text works
> > correctly in emacs --with-x-toolkit=gtk3 under xwayland.
>
> Yes, but are you running it under Wayland, or is it running under X?
>
> The PGTK port can run under both Wayland and X through GDK, and
> different GDK backends behave very differently when it comes to
> displaying tooltips from widgets inside offscreen windows.
>
> IOW, what is the value of (pgtk-backend-display-class)?
>

Oh right, sorry for the confusion. It's when running under wayland so
the value of (pgtk-backend-display-class) is "GdkWaylandDisplay"




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bug#53001; Package emacs. Full text available.

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From: Po Lu <luangruo@HIDDEN>
To: Akira Kyle <akira@HIDDEN>
Subject: Re: bug#53001: 29.0.50; xwidget-webkit: no mouseover text on pgtk
References: <86ee5oru1k.fsf@HIDDEN>
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Date: Tue, 04 Jan 2022 15:22:36 +0800
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 (Akira Kyle's message of "Mon, 3 Jan 2022 23:16:34 -0700")
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Akira Kyle <akira@HIDDEN> writes:

> On Mon, Jan 3, 2022 at 10:44 PM Po Lu <luangruo@HIDDEN> wrote:
>>
>> By "mouseover text" you mean tooltips, correct?  Are you running Emacs
>> in Wayland or are you running it in Xwayland?
>>
>
> I think different people refer to them differently, so I think some do
> call them tooltips. Concretely what I mean here is when the mouse
> hovers over an html <img> tag with the title field set, there should
> be a box that pops up next to the mouse with the value of that field
> set. So hovering the mouse over <img src='img.png' title="value">
> would display "value".

> This issue is only on emacs --with-pgt. The mousover text works
> correctly in emacs --with-x-toolkit=gtk3 under xwayland.

Yes, but are you running it under Wayland, or is it running under X?

The PGTK port can run under both Wayland and X through GDK, and
different GDK backends behave very differently when it comes to
displaying tooltips from widgets inside offscreen windows.

IOW, what is the value of (pgtk-backend-display-class)?

Thanks.




Information forwarded to bug-gnu-emacs@HIDDEN:
bug#53001; Package emacs. Full text available.

Message received at 53001 <at> debbugs.gnu.org:


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Subject: Re: bug#53001: 29.0.50; xwidget-webkit: no mouseover text on pgtk
To: Po Lu <luangruo@HIDDEN>
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On Mon, Jan 3, 2022 at 10:44 PM Po Lu <luangruo@HIDDEN> wrote:
>
> By "mouseover text" you mean tooltips, correct?  Are you running Emacs
> in Wayland or are you running it in Xwayland?
>

I think different people refer to them differently, so I think some do
call them tooltips. Concretely what I mean here is when the mouse
hovers over an html <img> tag with the title field set, there should
be a box that pops up next to the mouse with the value of that field
set. So hovering the mouse over <img src='img.png' title="value">
would display "value".

This issue is only on emacs --with-pgt. The mousover text works
correctly in emacs --with-x-toolkit=gtk3 under xwayland.

> > Is this something to be concerned about?
>
> No, it's not.  It should be fixed once the JSC developers deliver on
> their promise to provide an API to change the GC signal.
>

Great, thanks!




Information forwarded to bug-gnu-emacs@HIDDEN:
bug#53001; Package emacs. Full text available.

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From: Po Lu <luangruo@HIDDEN>
To: Akira Kyle <akira@HIDDEN>
Subject: Re: bug#53001: 29.0.50; xwidget-webkit: no mouseover text on pgtk
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Date: Tue, 04 Jan 2022 13:44:08 +0800
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Akira Kyle <akira@HIDDEN> writes:

> Just tested mouseover on emacs with x+gtk3 on sway, and mouseover text
> works there so I'm pretty confident this is an xwidget-webkit+pgtk
> issue and not a sway issue.

By "mouseover text" you mean tooltips, correct?  Are you running Emacs
in Wayland or are you running it in Xwayland?

Thanks.

> Also while testing I noticed this warning: "Overriding existing
> handler for signal 10. Set JSC_SIGNAL_FOR_GC if you want WebKit to use
> a different signal"
>
> Is this something to be concerned about?

No, it's not.  It should be fixed once the JSC developers deliver on
their promise to provide an API to change the GC signal.





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Subject: 29.0.50; xwidget-webkit: no mouseover text on pgtk
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Just tested mouseover on emacs with x+gtk3 on sway, and mouseover text
works there so I'm pretty confident this is an xwidget-webkit+pgtk
issue and not a sway issue.

Also while testing I noticed this warning: "Overriding existing
handler for signal 10. Set JSC_SIGNAL_FOR_GC if you want WebKit to use
a different signal"

Is this something to be concerned about? I don't know how emacs
internally handles SIGUSR1




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Subject: 29.0.50; xwidget-webkit: no mouseover text on pgtk
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In GNU Emacs 29.0.50 (build 1, aarch64-unknown-linux-gnu, GTK+ Version 3.24.30, cairo version 1.16.0)
Repository revision: ab5ee3e29e916d4009b301841e9780aad564a6a0
Repository branch: master
System Description: NixOS 22.05 (Quokka)

Configured using:
 'configure
 --prefix=/nix/store/0fiqa453abl4c1c28g0baqs9s274s7ff-emacs-pgtkgcc-20220103.0
 --disable-build-details --with-modules --with-x-toolkit=gtk3
 --with-cairo --with-xwidgets --with-native-compilation --with-pgtk'

Window manager: sway

Steps to reproduce:

- emacs -Q
- M-x xwidget-webkit-browse-url RET https://xkcd.com
- Hover mouse over the comic, there should be mousover text present

I also tested this on debian 11 under GNOME and observe the same
behavior. While emacs configured with the default with x+gtk3 the
mousover text works.

I also noticed that the cursor over "non-clickable" and non-text
elements is the I-beam cursor bar that is typically reserved for
hovering over select-able text elements. I would expect the cursor to be
the default mouse when hovering over, say, an image.




Acknowledgement sent to akira@HIDDEN:
New bug report received and forwarded. Copy sent to bug-gnu-emacs@HIDDEN. Full text available.
Report forwarded to bug-gnu-emacs@HIDDEN:
bug#53001; Package emacs. Full text available.
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