Fix bug regarding input exiting without changing

[shueja]

Entering and exiting an input element without changing the value will set the value to the last committed value, which might be for a different piece of data.

Steps to reproduce:

1. Create 2 waypoints. Select the first
2. Change its x coordinate and exit the input using Enter or clicking away.
3. Select the other waypoint.
4. Click into its x coordinate input and exit the input without changing anything.
5. The x coordinate of the second input will reset to the value of the the first