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Problem: Event handler declared with `once=true` can re-trigger itself (i.e. more than once!) by calling `nvim_exec_autocmds` or `:doautocmd`. Analysis: This happens because the callback is executed before deletion/cleanup (`aucmd_del`). And calling `aucmd_del` before `call_autocmd_callback` breaks the autocmd execution... Solution: Set `ac->pat=NULL` to temporarily "delete" the autocmd, then restore it after executing the callback. Fix #25526 Co-authored-by: Justin M. Keyes <justinkz@gmail.com>