The change was kind of intentional on {rB21e72496a629}.
That commit made mouse movement to "select" the contraint in Auto
Constraint a requirement.
This deduplicated the code a bit, but this requirement is not
comfortable for the first "selection" of the contraint.
So the constraint "selection" is now done in two ways:
- If there is no contraint, the "selection" is done immediately;
- If there is already a constraint, the "selection" is delayed by 1 event to simulate a constraint cancellation if there is no mouse movement.
bc6965cb98