Field editor not updated when a field changes in the simulation

[amrytov]

Describe the Bug

When you click on a field and a field editor opens for it, values in the editor don't reflect changes in the actual values.

Steps to Reproduce

1. Open any world
2. Click on 'Viewpoint/Orientation' (for example)
3. Rotate the camera
4. Watch the actual field values changing, while the values in the edit boxes remain static.

Expected behavior

Expect values in the boxes reflect the actual field values.

Screenshots

System

• Operating System: Windows 10

Additional context

I noticed this trying to use the customData field as a text input field instead of the "robot window". The controller checks using wb_robot_get_custom_data(), takes the text command and resets the field using wb_robot_set_custom_data(""). This was actually more convenient than the robot window. However, could not figure out for a while why resetting the field "doesn't work". It actually worked, but not affected the text widget.