LibreCAD theme conflicting

[Bollos00]

I have been using LibreCAD since the last semester for school projects and it has been being an excellent tool for me.
I used to use LibreCAD on Ubuntu, but two months ago I switched to Manjaro and LibreCAD theme seems to be weird.

This is how LibreCAD looks for me, I thought that it was just an adaptation to my gtk theme, but then I figured out that even when I switch to a gtk light theme, LibreCAD stayed still.

I have done a record showing this (Sorry for the bad quality). As it can be seen, every application changes the theme, but LibreCAD. What I really found weird is that the default theme is dark. That usually would not be a problem, but that way I cannot see the icons clearly.

##Informations about the system and LibreCAD:

Version: 2.1.3
Compiler: GNU GCC 10.1.0
Compiled on: Jul  7 2020
Qt Version: 5.15.0
Boost Version: 1.72.0
System: Manjaro Linux

OS: Manjaro Linux x86_64 
Kernel: 5.8.6-1-MANJARO 
DE: GNOME 3.36.

LibreCAD was installed with pacman.

Thanks in advance.

[Bollos00]

I have just found the issue, I will post the solution here for someone whom faces the same problem or for me of the future if I ever have this issue again.

There is this environment variable QT_STYLE_OVERRIDE that was defined with kvantum, this used to force all my Qt Applications to have this theme. It will be defined in one of those files:
~/.bash_profile
~/.profile
/etc/profile
/etc/environment

For me it was located on /etc/environment. Once Identified, delete or comment the line that define that variable (if it is in the /etc directory you will need root privileges).

Then reboot your system.

Next install the package qt5ct.

sudo pacman -S qt5ct

Now open the Qt Configuration Tool (qt5ct) and choose the theme that you want.

Reference:
https://bbs.archlinux.org/viewtopic.php?id=214147&p=3
https://wiki.manjaro.org/index.php?title=Set_all_Qt_app%27s_to_use_GTK%2B_font_%26_theme_settings
https://wiki.archlinux.org/index.php/Uniform_look_for_Qt_and_GTK_applications

[deric]

Looks like duplicate of #1144

[Bollos00]

Looks like duplicate of #1144

Yes. I did not see it.

Anyway, now that it is solved the issue can be closed.