Jason Gedge 860c2a606d
More bug fixes for completions (#2476)
* Use the cursor position for the span when between locations.

This fixes a bug where completing

    ls <TAB>

would result in replacing the entire line.

* Revert to the default update implementation.

Replacing the length of the elected value was intended to do replacement when
one moves inside a quote. The problem is that a long elected suggestion could
replace bits of a pipeline that are after the cursor. For example:

    ls <TAB> | get name | str collect
2020-09-01 16:10:46 +12:00
..
2020-08-19 07:34:05 +12:00
2020-08-19 07:34:05 +12:00