Problem:
LSP jump operations such as `buf.definition`/`buf.type_definition` do
not follow the 'switchbuf' option. Instead their behavior is controlled
by `vim.lsp.LocationOpts.reuse_win`. When `reuse_win=true`, the effect
is very similar to `set switchbuf=useopen`.
Note that functions like `buf.definition` open the quickfix
window when there are multiple results, and jumping between quickfix
entries already follows 'switchbuf', so unifying the behavior is more
intuitive.
Solution:
Follow the 'switchbuf' option and drop `reuse_win`.
We can achieve this behavior by using :cfirst when the quickfix list has
only one item, rather than customizing the jump logic as before.
57797ed7d4
