0.88 Linux. system theme not adhered

[jooch]

XnView: MP 0.88 / 64 bit
OS: Manjaro Linux 64bit

After upgrading to version 0.88 (needed to fix fontconfig issue) the system theme is not applied to XnView. All other QT apps work fine with the system theme. Qt5ct is set up.

Effect: Xnview will only apply Qt's default theme.

To reproduce:
1. Install version 0.88
2. Start XnView

Actual behaviour (bug): Fails to apply system theme

[xnview]

i use lastest version of QT now (Qt 5.9), so perhaps a problem here

[jooch]

I have qt 5.9.2 installed, so your version is older? I might have a system that was not updated recently, i'll test tomorrow.

[jooch]

I found a laptop which still used qt 5.9.0, it also has the same problem with the XnViewmp 0.88, but not with 0.87.
QT 5.9.1 was known to have problems with theming from what i could find on the Manjaro forums, but that was back in July this year and solved with 5.9.2.

[xnview]

I found a laptop which still used qt 5.9.0, it also has the same problem with the XnViewmp 0.88, but not with 0.87.
QT 5.9.1 was known to have problems with theming from what i could find on the Manjaro forums, but that was back in July this year and solved with 5.9.2.

strange i use 5.9.2

[sissou]

Same on my debian system, qt 5.9.2 : XNView will only apply Qt's default theme.
Theme was fine with XNView 0.87.

[xnview]

Same on my debian system, qt 5.9.2 : XNView will only apply Qt's default theme.
Theme was fine with XNView 0.87.

i ask QT team

[xnview]

Same on my debian system, qt 5.9.2 : XNView will only apply Qt's default theme.
Theme was fine with XNView 0.87.

is it GTK2, GTK3, KDE theme?

[sissou]

It's Arc GTK Theme, so GTK3 !
I use XFCE so I think it is GTK2 too ?

[jooch]

Same on my debian system, qt 5.9.2 : XNView will only apply Qt's default theme.
Theme was fine with XNView 0.87.

is it GTK2, GTK3, KDE theme?

Tested on XFCE system and Openbox, both configured for GTK2 and GTK3.
However, as far as i know QT5ct can only handle GTK2 themes.

[roland65]

I tested on the latest Ubuntu 17.10. There, I used the adwaita-qt package to match the adwaita gtk3 theme (I think there is no other way to match gtk3 themes). This worked with VirtualBox (that also uses Qt 5.9.2) but not with XnView MP 0.88, where the default Qt theme is always used.

[xnview]

on your system, which version of Qt do you have?

[sissou]

Same with qt 5.7.1 and 5.9.2

[roland65]

on your system, which version of Qt do you have?

This is Qt 5.9.1.

[xnview]

on your system, which version of Qt do you have?

This is Qt 5.9.1.

and if you try XnView not xnview.sh to use system libraries?