#vimtrickq: repeat last colon commanda: first `@:`, further repeats `@@`
https://vim.fandom.com/wiki/Repeat_last_colon_command
The last command entered with':' can be repeated with@: and further repeats can be done with@@ This is useful for commands like:bnext or:cNext.
@jartigag So ":" is an macro buffer that is automatically updated with the last colon command? Interesting!
Not that I use Vim anymore, but...