Vim added more flags for testing yet more dimensions of its Python
situation. Handle those in eval_has_provider().
vim-patch:8.0.1436: not enough information about what Python version may work
Problem: Not enough information about what Python version may work.
Solution: Add "python_compiled", "python3_compiled", "python_dynamic" and
"python3_dynamic" values for has().
ref: https://github.com/neovim/neovim/pull/10942#issuecomment-529479500
Move `has_eval_provider()` check to `eval_call_provider()` to make sure that
every code path calls it first.
Previously we would, when pynvim was missing, get a nice error message for
`:python3 1`, but not for `:py3file blah`.
Fixes https://github.com/neovim/neovim/issues/9485
In Vim (and some vestigial parts of Nvim) E319 was a placeholder for
ex_ni commands, i.e. commands that are only available in certain builds
of Vim. That is obviously counter to Nvim's goals: all Nvim commands
are available on all platforms and build types (the remaining ex_ni
commands are actually just missing providers).
We need an error id for "missing provider", so it makes sense to use
E319 for that purpose.
ref #9344
ref #3577
It is otherwise impossible to determine which test failed sanitizer/valgrind
check. test/functional/helpers.lua module return was changed so that tests which
do not provide after_each function to get new check will automatically fail.
Use the existing Vimscript function provider#pythonx#Detect()
to determine whether the Neovim Python module is installed and
Python 2/3 tests can be run.
