Extend the capabilities of is_os to detect more platforms such as
freebsd and openbsd. Also remove `iswin()` helper function as it can be
replaced by `is_os("win")`.
In Nvim, like DirChanged, this also triggers when switching windows.
This marks Vim patch 8.2.4335 as ported.
vim-patch:8.2.4335: no autocommand event triggered before changing directory
Problem: No autocommand event triggered before changing directory. (Ronnie
Magatti)
Solution: Add DirChangedPre. (closesvim/vim#9721)
28e8f73ae2
Problem: DirChanged is also triggered when the directory didn't change.
(Daniel Hahler)
Solution: Compare the current with the new directory. (closesvim/vim#3697)
2caad3fbbd