Fix BufReadFifo overlapping range on partial line

As reported in [1], when reading from a fifo a buffer that is not
newline-terminated, we add a newline automatically, and include that
in the range reported to BufReadFifo.

I'm not 100% sure if this is really wrong but since the typical
consumer of BufReadFifo does something like

	select %val{hook_param}
	exec |grep foo<ret>

it seems safe to remove this newline; doing so means that
1. "grep foo" will no longer see a newline in stdin, which
   seems good.
2. Kakoune will strip a trailing newline from the command output,
   since the input didn't have one. So the input is the same.

Let's remove any artificially-added newline from the hook parameter.

[1]: https://lists.sr.ht/~mawww/kakoune/%3CZzXjfXnETd2gbeXa@thristian.org%3E

0 files changed, 0 insertions, 0 deletions