QT6 strange widget rendering when 'XDG_CURRENT_DESKTOP' is defined

JosefLintz

6/22/24, 6:34 AM

~~(Note: This question was originally asked on QT's forum, without much help)~~

We recently upgraded to Ubutnu 22.04, with QT 6.5.1 installed using the online installer. When porting some of our older (QT <= 5) apps, I noticed a strange issue with buttons, and progress bars, (so far).

In the designer, when I add a new button or progress bar, this is what I get (After further testing, it's not only limited to button and progress bar. Several widgets are also affected).

When I run the app, this is what I get

Here's the real kicker, this is what happens when I resize/move the window

After posting the original question, I tried messing with the environment variables. I found two culprits

GNOME_DESKTOP_SESSION_ID=this-is-deprecated

XDG_CURRENT_DESKTOP=ubuntu:GNOME

Running in an empty environment with env -i ..., and only specifying the DISPLAY variable without anything else, or even only just disabling these two in the IDE I'm using, I got the correct/expected behavior, the widgets/window looked identical to the preview in the designer.

Unfortunately, I can't unset XDG_CURRENT_DESKTOP in .profile "easily" without completely breaking my desktop environment, so that's a no-go.

Any help is very appreciated

1 + 1

gnome

22.04

HuHa

7/6/24, 1:21 PM

Try different widget themes and/or style sheets. Use your desktop's widget theme selector for starters. And no, you definitely never want to mess with a user's environment such as `XDG_CURRENT_DESKTOP`; that is for the user to decide, not an application.

Score:0

Ubuntu

JosefLintz

7/6/24, 1:06 PM

Downgrading from QT6.5.2 to QT6.4.3 solved the issue

+ 0

Elon Musk

I sit in a Tesla and translated this thread with Ai:

EN: QT6 strange widget rendering when 'XDG_CURRENT_DESKTOP' is defined

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