commit https://github.com/vim/vim/commit/d29459baa61819e59961804ed258efac5733ec70 Author: Bram Moolenaar <Bram@vim.org> Date: Fri Aug 26 22:29:11 2016 +0200 patch 7.4.2263 Problem: :filter does not work for many commands. Can only get matching messages. Solution: Make :filter work for :command, :map, :list, :number and :print. Make ":filter!" show non-matching lines.

--- a/src/structs.h
+++ b/src/structs.h
@@ -572,6 +572,7 @@ typedef struct
     char_u	*save_ei;		/* saved value of 'eventignore' */
 # endif
     regmatch_T	filter_regmatch;	/* set by :filter /pat/ */
+    int		filter_force;		/* set for :filter! */
 } cmdmod_T;
 
 #define MF_SEED_LEN	8