Fix placement of ColorPicker in the editor

[Chaosus]

My attempt to Fix #91722

[KoBeWi]

I'm looking into that right now and BoxContainer was already using is_visible_in_tree(), so I don't get why the new method wouldn't work.

[Chaosus]

@KoBeWi Ok, if you find the right solution, feel free to close this PR.

[KoBeWi]

Ok I missed that BoxContainer used is_visible() for minimum size. And apparently you need to revert both containers to fix the issue.

Aims to solve similar issue for SplitContainer, to allow using is_visible_in_tree() for minimum size. @kitbdev do you think this can be applied to all containers?

Alternate solution is either introducing a separate method or adding argument to as_sortable_control(), with intention to be used for minimum size. The argument could be an enum actually, to handle containers that ignore visibility 🤔

For now this PR is fine though.

[kitbdev]

I think we should make as_sortable_control use is_visible so it works when the Container is not visible. This way all Containers can calculate minimum size at any time.
To stop Containers from sorting while it is not visible in tree, we can just add a guard for each one when it sorts children.

[akien-mga]

Thanks!

[KoBeWi]

I think we should make as_sortable_control use is_visible so it works when the Container is not visible.

I tried that originally and it crashed the editor on startup.