test(completion): make the lower-bound span test discriminate

date:las..today put the caret at the end of the lower bound, where the
whole-bound span and the typed-so-far span are both 3 characters long, so
the test passed even against a tokenizer that truncates at the caret and
never sees the range separator. Moving the caret mid-bound with
date:lastweek..today separates the two: 8 under correct code, 3 under the
truncating one. Mutation-verified in both directions.

0 files changed, 0 insertions, 0 deletions