The Color Picker window, when resized, very often gets stuck, for example, if the window is shrunk, it cannot be expanded again.\

Steps to reproduce:
1) Open any project.
2) Open the Color Picker (from Camera, for example).
3) Click and drag the bottom-right corner of the Color picker window to reduce its size.
4) Release the mouse.
5) Try expanding the Color Picker window.
- If it didn't reproduce, open a new Color Picker window instance.

The window cannot be expanded on one or both dimensions (width or height), often hiding its contents. This can be worked around by opening a new Color Picker window instance. This doesn't occur with other pop-up windows.

Reproduced on:
5.6.0b3, 5.5.0p1