Describe the bug
When you click in daily/weekly view to create a new task, it has no end time, and its length is consistent with the default duration. If you now move this same task, its end time does get added, and the duration stays the same.

I expect the end time to get added upon creating the task this way. This would prevent confusion if you change the default duration later on.

To Reproduce
Steps to reproduce the behavior:

1. go to the weekly or daily planner
2. create a task by clicking on the timeline

Expected behavior
A new task gets created with the time decided based on the default duration.

Actual behavior
A new task gets generated with no end time, and it is left to the viewer to visualize the task with the default duration (which could lead to unexpected overlap/changes when the default duration gets changed)

Note
This issue would get implicitly resolved if issue #341 gets implemented without an option to turn it off.
The default duration would now only be relevant if you manually type a task with no end time.