Yes!!! I've always wanted this, just didn't get to actually implementing it. (Not tested or reviewed yet, just a big conceptual thumbs up.)
---
While you remember what you are doing in terms of filtering, I think there are also open issues regarding filtering the open documents tab which I think would also be useful too (I don't use it that much myself though).
Also a good opportunity to finally test the LSP plugin :-P.
Setting it up for Geany development is really trivial, just 1. `sudo apt install clangd` 2. `meson setup build` in Geany source directory (so `compile_commands.json` is in the build directory, you don't actually have to build Geany using meson afterwards and can use autotools if you prefer them) 3. Points 2-5 from https://github.com/techee/geany-lsp?tab=readme-ov-file#quick-start
(I still have a feeling that the word "server" scares off many people as everyone imagines some complicated configuration like setting up Apache or whatever and in fact, you typically don't have to set up anything, it's pre-configured in the plugin for most common servers, and the plugin starts/terminates the server for you.)