How to reproduce:
1. Download a project from OwnCloud and open it.
2. In the Hierarchy select "sk62_clementine400" and go to Window > Animation.
3. In Animation window expand "sk_62_clementine400 : Position".
4. Play the animation.
5. Stop it at any point.
6. Try to check the whole "sk_62_clementine400 : Position" > "Position.x" value by double-clicking it.

Expected result: It is possible to check keyframe's full value even when the animation is read-only.
Actual result: there is no way to check keyframe's full value when the animation is read-only.

Reproducible with - 2018.2.0a5, 2018.1.0b12, 2017.4.0f1, 2017.3.2f1, 2017.2.2p1, 2017.1.3p2, 5.6.5p3