Duplicate dates and times in date polls create unwanted additional columns, breaking votes
When one creates a date poll with duplicate dates and same times (e.g. autofilled from first), then removing of some of these duplicate columns duplicates other duplicate columns, which changes already created votes.
Example: https://framadate.org/QNclQShBBe5TBByIAWIIwdij/admin
Steps to reproduce:
- Create a date poll with a same date in two "lines"
- Autofill all the times, e.g. to morning, noon and evening
- Add a vote in the new poll
- Remove one of the duplicate columns
Result: Other duplicate columns re-duplicate, but do not shift the votes, assigning the votes to different days than to which they were cast (possibly rendering the poll useless).
Note: This seems similar to issue #139 (closed), which is already closed, yet I've reproduced the bug today.