1.4.0: GTK2 Theme not correctly applied on application startup [Solved]

[anonsan]

XnView MP 1.4.0 amd64
OS: Debian Sid amd64

Since 1.4.0 some UI elements are not themed when the application starts. I use QT_QPA_PLATFORMTHEME=gtk2 to match the GTK theme. Switching themes in Gnome Tweaks fixes the problem for the currently running instances. Other Qt applications are unaffected. Tested qBittorrent, SMPlayer and Audacious.

Effect: UI becomes visually unappealing and difficult to use.

To reproduce:
1. Start XnView MP with "env QT_QPA_PLATFORMTHEME=gtk2 xnview"

Actual behaviour (bug):
After starting:


After changing themes in Gnome Tweaks:


Expected behaviour:
The application immediately looks like the second picture.

[anonsan]

Looks like the same issue as viewtopic.php?p=183508.

[xnview]

Looks like the same issue as viewtopic.php?p=183508.

with 1.3.1 no problem?

[anonsan]

Looks like the same issue as viewtopic.php?p=183508.

with 1.3.1 no problem?

Yes, almost certain I first noticed this after upgrading to 1.4.0. Do you have a 1.3.1 .deb so I can confirm?

[cday]

Looks like the same issue as viewtopic.php?p=183508.

with 1.3.1 no problem?

Yes, almost certain I first noticed this after upgrading to 1.4.0. Do you have a 1.3.1 .deb so I can confirm?

Previous versions.

[anonsan]

with 1.3.1 no problem?

Yes, almost certain I first noticed this after upgrading to 1.4.0. Do you have a 1.3.1 .deb so I can confirm?

Previous versions.

Thanks, confirmed. 1.3.1 works as expected.

[xnview]

which theme do you use, to reproduce the problem?

[anonsan]

I use https://www.gnome-look.org/p/1316887/

[xnview]

Thanks to your detailed description I can reproduce the problem.

[anonsan]

Good to see it fixed, thank you.

[xnview]

This problem is supposed to be fixed in XnView MP 1.4.2. Please check and confirm the bug fix here.

[anonsan]

Confirmed fixed.