Set focus on the last clicked button in constraint entry dialogs

[YOUSSEF HOUIET]

Hi,
Many users experience issues in the constraint entry dialogs, especially when entering constraints one by one for teachers or students, as they are used to pressing the Enter key instead of clicking the Add button.
In recent versions, the focus is often on the Delete or Modify button.
Users request that the focus be set to the last button clicked in the dialog.

[Liviu Lalescu]

Hello,

It is done, thank you!