Use 'setfiletype' to set local &filetype #473
Merged
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'setfiletype' is nice in these cases because it prevents &filetype from
being set redundantly.
Note that the Vim runtime ships with a filetype match for *.ex (for
Euphoria), but our plugin-based filetype detection still gets the last
say.
Also, use 'setlocal' when setting &filetype in the shebang detection
path. We don't want to use 'setfiletype' here because it's possible we
need to override an existing syntax assignment, and we already guard
against setting &filetype to 'elixir' twice.