Oldtests clean up after themselves, and the options that need operators
to align with Vim all deny duplicates, so there is no need to set them
to default.
Also make the variable name that test_listchars.vim uses to align with
Vim more obvious.
The options 'path', 'include', and 'define' all use C-specific default
values. This may have made sense a long time ago when Vim was mostly
used just for writing C, but this is no longer the case, and we have
ample support for filetype specific configuration. Make the default
values of these options empty and move the C-specific values into a
filetype plugin where they belong.
Co-authored-by: zeertzjq <zeertzjq@outlook.com>
Problem: No test for right click extending Visual area.
Solution: Add a test. (Dominique Pelle, closesvim/vim#5018)
6aa7523b96
Co-authored-by: Bram Moolenaar <Bram@vim.org>
