commit https://github.com/vim/vim/commit/88e484bf1b0afb5f2dec44f19335729578ace66a Author: Bram Moolenaar <Bram@vim.org> Date: Tue Nov 24 15:38:44 2015 +0100 patch 7.4.938 Problem: X11 and GTK have moure mouse buttons than Vim supports. Solution: Recognize more mouse buttons. (Benoit Pierre, closes https://github.com/vim/vim/issues/498)

" For Yiddish capitals should not be checked.  But only change the
" 'spellcapcheck' option when it is not at its default value.
let s:spc = &l:spc
setlocal spc&
if s:spc == &l:spc
  setlocal spc=
else
  let &l:spc = s:spc
endif
unlet s:spc