Update icons

[Yanpas]

Besides visual refresh I suggest to switch to vector images instead of raster.

There are many open source icon sets, for example Breeze from KDE, Adwaita (GNOME), Elementary. Libreoffice ships various icon themes

[dzmipt]

I think I am not good designer. I am ok with the current set of icons. Functionality, convenience and clarity are much more important to me rather that graphics in the icons. However if there are better set of icons, I will check them. :)

As for vector graphics, I think Java doesn't natively support vector images. There are third party libraries for this. But, key question what it gives to the us. I mean at the moment all sizes are static. And if i know size of the icons in pixels, I can prepare raster image of such size in advance. Do I miss anything?

[Yanpas]

Vector icons are good for fractional scaling: displays with high DPI usually configured with 125%, 150% zoom

[dzmipt]

I read that Java doesn't work ok with scaling on high DPI screens. If you can try a test example with Java 8 (or even may be with some other later version of Java), it would be interesting