Ultimate goal is to implement per-icon fallback logic:
- Search icon in the active icon theme — if found, use it.
- Search it in the icon set that is specified in Krusader config — if found, use it.
- Search it in Breeze (in case it's installed) — if found, use it.
- Otherwise use a default "not-found" icon (like a question mark). Opinions about what icon to use here are welcome!
FIXED: [ 372964 ] At least one Oxygen icon in Krusader is not correctly seen (using Kubuntu 16.04)
FIXED: [ 388691 ] Problems with "edit-select-none" icon and "edit-select" icon?