elem_filters for type=signal choose-elem-button

[IsoSchiz]

choose-elem-button is awesome. But it doesn't quite allow easy re-creating of the conditions UI.

A quick addition would be the ability to add elem_filters for type=signal. The filters should support:

• Show/hide meta-signals (signal-everything, signal-anything, signal-each) - need control of each meta-signal independently as sometimes only each or every is appropriate, sometimes every and any are but each isn't, etc.
• Show/hide the "Or set a constant" sub-panel (e.g. from the RHS of the train-stop "Enabled Condition" UI)

[Rseding91]

Just FYI: the "or constant" is not a thing when it comes to signals so that's never going to happen with this CustomGuiElement type. A 'signal ID' is one of a special signal, a fluid, or an item.

[IsoSchiz]

Yup, understood.

Would it be possible to provide a composite custom GUI element that returns a CircuitCondition (and behaves the same as the various existing ones, with the "or constant" behaviour for the RHS)?

This is a relatively common use case, and while it's possible to replicate, it's difficult to get entirely right (especially with the same UX as vanilla UIs).