NixOS KDE Plasma: fix some missing GTK icons @ Lyoneel.dev

No icons on Inkscape

This issue was found and fixed using NixOS 23.05 (Stoat).

I was trying to edit an SVG with Inkscape, and I found this:

Missing icon in Inkscape, a GTK application

Normally look like this:

correct icons in Inkscape, a GTK application

The rest of the icons but + and - signs seems to work fine, it only affects GTK applications.

To solve this, I added the following packages for my NixOS configuration

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pkgs.gnome.adwaita-icon-theme
pkgs.gnome-icon-theme
pkgs.hicolor-icon-theme

Now you will have GTK icons rendered correctly.