Re: [gentoo-user] Some symbols render incomplete in text mode

[Michael]

On Saturday, 30 April 2022 12:49:59 BST gevisz wrote:
> пт, 29 апр. 2022 г. в 00:42, Frank Steinmetzger <Warp_7@×××.de>:
> > Am Thu, Apr 28, 2022 at 09:20:08PM +0300 schrieb gevisz:
> > > ср, 27 апр. 2022 г. в 13:55, Frank Steinmetzger <Warp_7@×××.de>:
> > > > Am Sun, Apr 24, 2022 at 11:57:49PM +0300 schrieb gevisz:
> > > > > After a recent update of my Gentoo system, I have noticed that some
> > > > > symbols may be rendered incomplete in a text mode.
> > > >
> > > > What exactly do you mean with “text mode”?
> > >
> > > By "text mode" I mean that "it happened in Gvim, in a web-browser
> > > and in a dialog-window for saving files" but not in videos or pictures.
> >
> > I see, you mean text that was actually rendered and not part of an image.
>
> Yes. Thank you for replying to this thread once more.
>
> Yesterday evening I finally managed to catch the problem
> with incomplete rendering of cyrillic letters "in text mode"
> and make a screenshot of it. This time, it happened in
> html page that was open in google-chrome.
>
> A properly cropped screenshot of it is attached to this email.
>
> As it may happen that you and other readers of this thread
> are not familiar with cyrillic letters to the extent needed to see
> that they are rendered incomplete, I also add a screenshot
> of the same text rendered complete. I made it this morning
> with the same google-chrome.
>
> By the way, this means that the problem appears from time
> to time and does not look to be easily reproducible.
>
> I even assume that it may be a hardware problem
> as my computer is quite old, but unfortunately
> can not check this assumption so far.
>
> > I noticed that those applications you mention are all GTK-based.
>
> Yes, I try not to mix GTK and Qt on this old computer
> as much as possible to reduce the time needed
> to update the system. So, most of the applications on
> it use GTK. The only one that I know uses Qt is VLC
> as it does not work properly with GTK. However, I use
> it quite rarely.
>
> > Do you have any available that are built on Qt (or any other toolkit)?
>
> I am afraid that VLC is the only one.
> Once tried Qutebrowser was removed a long time ago.
>
> > I can’t say that I have seen that youtube issue before. But I also have no
> > idea what it could be or how to solve it. Could you create a new browser
> > profile and check whether the issue is still present there? This could
> > tell
> > us whether it’s an issue with your existing profile.
>
> I will try to create a new user and run google-chrome from his profile
> and report the result here.
>
> However, when the disk with my /home directory
> was for a few months installed on another computer
> also runned by Gentoo with similar configuration
> I have not noticed such problems.
>
> Moreover, I am starting to suspect that
> the problem with incomplete rendering letters
> "in text mode" and the problem with symbols
> in the youtube video player toolbar may be
> separate ones as the latter is much more
> reproducible and appears only in google-chrome
> (have not noticed it in Firefox, for example,
> though I quite rarely use Firefox to view youtube videos).

I can't offer much help on this, but I'll share a similar experience.  I have 
seen something like this happening on Chromium, running on Enlightenment 
desktop a few years ago.  I recall it was affected by the scale set on the 
desktop 1.2:1 or something like that.  I can't recall if this was also 
occurring on Plasma.  I think I saw the same missing character problem on the 
title bar of the browser window.  This was on English text (UTF8 encoding).  
Firefox and other applications didn't have a problem.  At that time I recall 
Chromium's rendering of the menu/toolbar and window border was fighting against 
the desktop.  Some update on Chromium eventually fixed things.  So I blamed it 
on the interplay between the desktop, browser and graphics card/driver 
(radeon).