Use the new Popup api for the color picker button

[lucasmerlin]

The color picker popup is now aligned to the bottom left edge (instead of the bottom right), but I think this makes more sense and is aligned with ComboBox etc. It also gets the new nice auto positioning.

• closes Update color picker buttons to the new popup api #5832
• I have followed the instructions in the PR template

[github-actions]

Preview available at https://egui-pr-preview.github.io/pr/7137-lucascolor-picker-popup
Note that it might take a couple seconds for the update to show up after the preview_build workflow has completed.

[emilk]

The color picker closes on each click within it now. It should only close one escape and when clicking outside of it.

[emilk]

https://egui-pr-preview.github.io/pr/7137-lucascolor-picker-popup/ still closes when I click within the color picker

[lucasmerlin]

egui-pr-preview.github.io/pr/7137-lucascolor-picker-popup still closes when I click within the color picker

That's so weird. It doesn't do it when I run it natively:

Screen.Recording.2025-06-18.at.09.14.44.mov

Maybe something went wrong when updating the preview app? A race condition?

Edit: I redeployed and now it works in the preview. Must've been a fluke.