Slider value in keypad navigation jumps directly to minimum/maximum

Steps:
1. launch Stylesheets example from fluildlauncher
2. Scroll down until sliders is selected
3. Click select key to activate slider edit mode
4. Click directional navigation to right few times, slider value is changed step by step
5. Press an hold navugatiom button to right -> slider value changes to 99
6. Click left -> value changes directly to 0. It is not possible to change the value anymore step by step