patch 8.1.1884: cannot use mouse scroll wheel in popup in Insert mode commit https://github.com/vim/vim/commit/f0bc15c769b60f472d411b3ef98d57db510113c1 Author: Bram Moolenaar <Bram@vim.org> Date: Sun Aug 18 19:23:45 2019 +0200 patch 8.1.1884: cannot use mouse scroll wheel in popup in Insert mode Problem: Cannot use mouse scroll wheel in popup in Insert mode. Mouse clicks in popup close the popup menu. Solution: Check if the mouse is in a popup window. Do not let mouse events close the popup menu. (closes #4544)

" 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