@b4n Thanks for having a look at it - I'll address the changes you suggested.
Apart from that, I was kind of disappointed that the "goto file" only lists Geany open documents rather than the project's documents -- maybe you'd like to add that?
Definitely makes sense for projectorganizer which knows what files belong to the project. So yes, I should add that. This isn't possible in the LSP plugin from which this feature was taken because the plugin itself doesn't know what files belong to the project (this is only known to the server).
Maybe I could also re-introduce the fuzzy search you use in the Commander plugin so one doesn't have to type the searched query exactly. In the LSP plugin it didn't make sense for the workspace symbols where the server did something like that already but e.g. for file names or file's symbols it could be useful (still we probably shouldn't use it for workspace symbols because there's way too many of them and filtering them could take too long because of this).
Also, I hoped to be able to go to a specific file's line, not only in the current file -- but that's probably less useful in practice.
Probably not hard to add something like `filename.c:123`, I'm just sure I'd be too lazy to type something like that :-). But maybe e.g. the right arrow could complete the value in the search entry to the selected value in the list so one could then just type `:123`.