To be more verbose: the licensing is annoying but the solution here using an allowlist is pretty good and it's nice that we already get almost all themes included.
Thanks for digging through all the themes and put up the list.
After we have merged this, we could add a note to the geany-themes repo's README to show that the themes with compatible license are included semi-automatically.
Is it worth adding a note to `doc/making-a-release`?