Environment

Caused by #1197.
More apparent in #2184.

Steps to reproduce

1. ensure double click delimiters includes " "
2. double click on empty line

Expected behavior

Selection should encompass entire line.

Actual behavior

Selection encompasses one cell.

Additional Info

This one's on me. Idk why I thought that double clicking a delimiter should only select the delimiter itself. That's not useful.

Instead, the selection seems like it should expand to the first non-delimiter in either direction (exclusive range). For example,
O is non-delimiter
X is delimiter
Double clicking on any of the X would result in the following selection (denoted by [ and ])
OOOXXXXXXOOO
OOO[XXXXXX]OOO