[Bug] Ineffective Followup Task Adjustment when Modifying Preceding Task's End Date

[rickyweb]

Summary:
When adjusting the end date (planned) of a task that has a followup task linked to it, the modification has no consequence on the followup task, rendering the link ineffective.

Steps to Reproduce:

1. Create two tasks in a project, one planned to start on day 1 of the next month and end on the 10th, the other planned to start on the 10th and end on the 15th.
2. Connect the two tasks in the GANTT view by dragging a line between the end of the first and the beginning of the second task.
3. Adjust the planned end date of task 1 to the 11th by dragging the task bar.

Result:
The planned end date of task 1 is correctly moved to the 11th, but there is no impact on task 2.

Expected Result:
The planned start date of task 2 should move to the 11th, and the planned end date of task 2 to the 16th, and the planned end date of the project to be automatically adjusted accordingly.