Problem: When z= fails due to no word being found, 'spelllang' being
unset or a multiline visual selection, 'nospell' is not
restored.
Solution: Jump to where the user configured value of 'spell' is restored
instead of returning early (Luuk van Baal).
closes: vim/vim#19525eba078fc47
Problem: Too many delete() calls in tests.
Solution: Use deferred delete where possible.
56564964e6
This includes all changes expect changes in test_startup.vim.
Co-authored-by: Bram Moolenaar <Bram@vim.org>
