Problem: `attempt to yield across metamethod/C-call boundary` error when
trying to use `vim.pack.add()`.
Solution: use `pcall()` variant from 'coxpcall' on non-LuaJIT version of
Lua.
Problem: On canceling the update (triggering `WinClosed`), the tab page
will most probably be closed too. Closing some other tab page while the
confirmation buffer is open also changes tab page numbers. We are trying
to close the wrong tab page in both cases.
Solution: save the tab page ID, and attempt to get the tab page number
from the ID when closing the buffer.
Problem:
Error when adding a plugin will make all following plugins not
`:packadd`ed
Solution:
- add() should handle errors from :packadd with pcall()
Co-authored-by: Evgeni Chasnovski <evgeni.chasnovski@gmail.com>
Co-authored-by: Justin M. Keyes <justinkz@gmail.com>
