Problem: 'listchars' should be window-local.
Solution: Make 'listchars' global-local. (Yegappan Lakshmanan, Marco Hinz,
closesvim/vim#5206, closesvim/vim#7850)
eed9d46293
Nvim already has this feature, but it implements :set listchars the same
as :setglobal listchars, which is incorrect. Vim's implementation of
:set listchars is correct: using :set listchars clears local value.
These options were previously global. A global-local window option
behaves closer to a global option "per default" (i e with :set),
but still supports local behavior via :setl
Also this restores back-compat for nvim_set_option("fcs", ...)
which are currently broken on 0.4.x but worked in earlier versions
It is perfectly fine and expected to detach from the screen just by
the UI disconnecting from nvim or exiting nvim. Just keep detach() in
screen_basic_spec, to get some coverage of the detach method itself.
This avoids hang on failure in many situations (though one could argue
that detach() should be "fast", or at least "as fast as resize",
which works in press-return already).
Never use detach() just to change the size of the screen, try_resize()
method exists for that specifically.
