Describe the bug
#5814 made it so you need to call keep_popup_open or the popup will close. Since the color picker doesn't use the new popup yet, it now immideately closes.

To Reproduce
Steps to reproduce the behavior:

1. try using color picker on egui.rs

To fix this we should ensure all places using the Memory::popup api are either

• updated to use the new Popup struct
• updated to call keep_popup_open