Change icons in theme-extension

[manics]

This recent post might help?

Use custom icon on launcher item

Yeah, kernels are needfully special, as they serve up pngs from the backend, rather than a LabIcon. The svgStr of a LabIcon needs to be an actual SVG. You’ll want to (optionally) make a typing override prepare your SVG make sure it’s well formed (proper XML declarations, etc) get rid of all id attributes clean up all the cruft you can inkscape is good for this, with it’s Optimized SVG export format svgo can be useful if you have a ton of icons, but does have some binary dependencies that…