Changing theme Light<->Standard doesn't restore the title bar color

[GT]

This is Ubuntu 20.04 beta.

Start a program that has title bar. Try Firefox or whatever. Then navigate to settings->appearance.
Now set the theme to Standard, then Light - Firefox will now have white theme with dark titlebar.

Setting to Dark resets the bug.

[Daniel van Vugt (vanvugt)]

I can't seem to reproduce any bug here. Can you provide a screenshot of the problem you see?

[GT (gtio)]

Yes, here is a screencast of this bug. See how title bar theme persists when switching from standard to white

[GT (gtio)]

And it's not firefox-specific, chrome is also affected.

[Daniel van Vugt (vanvugt)]

Got it thanks! I was using 'Ubuntu on Wayland' where the bug does not occur.

[GT (gtio)]

It is not firefox-specific bug, it has nothing to do with ff!

See my webm, there is a chrome alongside ff and it's also affected. VLC is also affected.

[GT (gtio)]

It also has nothing to do with display server. This is ubuntu wayland session, same bug.

[Daniel van Vugt (vanvugt)]

I guess you've turned off integrated titlebars, which is why I see different behaviour and no bug in Wayland sessions.

[Daniel van Vugt (vanvugt)]

Oh come to think of it, there is a commonality between Firefox, VLC and Chrome. That is they all try to follow the system theme but all three are NOT GTK apps. They each use different toolkits. So I fear this is the same basic problem that will need to be fixed in three different toolkits.

[Daniel van Vugt (vanvugt)]

See also bug 1791307 for Chromium. Perhaps these bugs need to be integrated.

[GT (gtio)]

Well, it works when you change theme from Dark to White, but doesn't work when you switch from Standard to White.

This doesn't look like a problem with the software for me.

>I guess you've turned off integrated titlebars
I didn't turn off anything, it's freshly installed ubuntu 20.

For me firefox on wayland doesn't have this title bar at all.

[GT (gtio)]

Chrome and VLC have it though

[Olivier Tilloy (osomon)]

I'm seeing the problem in xorg sessions too. Note that VLC’s user interface is a Qt application. Chromium is a snap, and not a pure GTK application (although using GTK to draw window decorations and menus), as pointed out by Daniel. Similarly, firefox is not a pure GTK application.

Also of interest: gnome-terminal (a pure GTK application) doesn't respect any theme setting, its window title bar is always dark.

[Sebastian Ramacher (s-ramacher)]

vlc has no code to handle that. That's all done by Qt. Re-assigning accordingly.

[Daniel van Vugt (vanvugt)]

Olivier, the issue with gnome-terminal is bug 1873394 :)