Re: EDGE_FULL_BACKGROUND

On 9/1/2024 6:53 AM, 'Neil Hodgson' via scintilla-interest wrote:
>     The monitor positions in global coordinates shouldn't matter as GTK provides a window coordinate space to draw in.
>
>     Was the problem here that the margin width and scroll position 'xStart' weren't added in as they are for the EdgeVisualStyle::Line case?
>
No. It highlighted FROM column 80 to the left margin instead of the right. Been a problem with Gtk and multiple monitors for a long time. That's why so few Linux distros bother supporting Gtk based desktops anymore.

Problem is worse under some distros, like Arch, which doesn't 
automatically store "RightOf" when monitors are dragged 
<https://bbs.archlinux.org/viewtopic.php?id=289850>.

One of the reasons I chose to use Cinnamon edition of Manjaro is the 
fact it gives you a /real/ desktop which Gnome does not. The other 
reason was to see just how failed the Wayland experiment is 
<https://forums.linuxmint.com/viewtopic.php?t=411761>. Yes, that's a 
Mint forum, but a pretty accurate summary of where things were in 
January. I can tell you that even with the latest updates on Manjaro 
Cinnamon the lock screen will not accept /any/ password. Wayland does 
X11 emulation and it isn't very polite at informing X11 about the 
current arrangement of monitors. At the time of the problem I did not 
open the file documented in that post to see if it was missing the 
"RightOf" line. I suspect it was.

At the time I was creating the Yocto built OS for this device 
<https://www.kneevoice.com/>, we had a real PITA. Due to a smoke filled 
room mafia-type deal between Qt, NXP, and The Yocto Project, they 
dropped all X-11. You had to use Docker containers and Wayland. We could 
not, by application, control either screen position or orientation. The 
YAML for the container would let us control orientation, but not screen 
position. Instead of a group of dynamically positional "application 
bricks" they had to be bricks run by a single full screen window inside 
of a single app.

With this Wayland stuff there is now a disconnect between what the 
actual desktop knows and what Gtk (or other old libraries) "see" when 
making raw low-level X-11 calls. I don't expect the emulator to 
"improve" because the boys and girls pushing Wayland want to purge all 
X-11. Not wanting to totally dominate the mailing list with this topic, 
but a good discussion can be found here 
<https://askubuntu.com/questions/11537/why-is-wayland-better>.

Basically all of the higher end graphics cards/drivers and desktops have 
compositors and Wayland wants to be "One Compositor to Rule Them All" 
with a direct connection to the kernel. Well that's just bright and 
beautiful for the "desktop" user. Ass-U-Me-ing every OpenSource product 
also abandons X-11 and re-writes with a Wayland UI library all creatures 
great and small will sleep as one tonight.

In my world, embedded systems for mostly medical devices, we don't 
need/want/or desire a "desktop" layer be forcibly inserted into the 
device that is trying to fix your heart or perform some other medical 
function. Despite all its flaws X-11 was proven, FDA approved (many 
version) and we knew just what to strip out to make it secure. Many/most 
of our devices don't even allow in-bound connection from the outside 
world in any form.

So yes Neil, I knew all of this; it comes up during every project; yet I 
still flipped left and right to make it work because that is what I had 
to do. I believe there was and possibly still is a series of calls one 
can do with X-11 based libraries to determine if this problem exists on 
the target. Didn't dig into that either.

-- 
Roland Hughes, President
Logikal Solutions
(630)-205-1593  (cell)
https://theminimumyouneedtoknow.com
https://infiniteexposure.net
https://johnsmith-book.com

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