commit https://github.com/vim/vim/commit/b127cfd75f59e82580df395b6e2c009774644b16 Author: Bram Moolenaar <Bram@vim.org> Date: Sun May 29 16:24:50 2016 +0200 patch 7.4.1858 Problem: When a channel writes to a buffer it doesn't find a buffer by the short name but re-uses it anyway. Solution: Find buffer also by the short name.

Test for ":options".

STARTTEST
:so small.vim
:let caught = 'ok'
:try
  :options
:catch 
  :let caught = v:throwpoint . "\n" . v:exception
:endtry
:buf 1
:$put =caught
:"
:" Test that changing 'path' keeps two commas.
:set path=foo,,bar
:set path-=bar
:set path+=bar
:$put =&path
:/^result/,$w! test.out
:qa!
ENDTEST

result