Property value in the Edit Keyframe dialog is shown with much precision

Edit keyframe dialog is showing the property value with much precision, see picture. Modified value will also get extra digits.

Steps to reproduce:

1. Create a project
2. Add view3d
3. Create a timeline
4. Animate the translation of the cube. Use the 3D Editor for recording the animation
5. In the timeline, click the arrow in front of the item name to show the animated properties and keyframe markers
6. Double-click some of the created keyframe markers to open the Edit Keyframe dialog
7. Property value is shown with a lot of digits. Maybe less would be enough?
8. Erase the value and give a new value with two digits after decimal point, e.g. "100.05"
9. Click OK to close the dialog
10. Open the dialog again and the value is again presented with a lot of digits after decimal point (100.05000305175781)