[Feature request] Way to edit Start and End times when in edit mode

[João Nunes]

Problem

Sometimes I forget to start/stop the timer so I just edit the block and change the unix time entries to the time I want. I also change some timings to exact timing like (15:59 becomes 16:00).

Feature

It would be faster if while in edit mode, there was an option to change the start/end time.

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I also can look into this and implement it if @Ellpeck or other maintainers approve this.

[João Nunes]

Duplicate of #9.