Which fff frontend(s)?

Neovim plugin (fff.nvim)

What problem are you trying to solve?

My specific use case is to configure my whole screen to dim when the picker is open, similar to Folke's Snacks. So either that would be nice directly, or we could just expose some User autocmds that fire at the right places. I think the autocmd option is easiest for now.

Proposed solution

vim.api.nvim_exec_autocmds("User", { pattern = "FFFOpen" })
-- ... picker runs ...
vim.api.nvim_exec_autocmds("User", { pattern = "FFFClose" })