Form builder: Rename "isHidden" field to "isVisible"

[JohnL17]

I think it would be better if we rename the "isHidden" field to "isVisible". When a user wants to build a form, the form should show specific fields if a radio button or a checkbox is clicked and not hide them.

For example:
'nutzungsart-wohnen' in 'nutzungsart'|answer
is more understandable than
!('nutzungsart-wohnen' in 'nutzungsart'|answer)

[anehx]

Actually, this behaviour is absolutely by design. If we'd name it isVisible we'd have to put in a value true per default. The default state of a field should always be "visible"..

[anehx]

CC @czosel @kaldras

[czosel]

What speaks against changing the default to true?

[anehx]

The default state would then be hidden, right? So if we change any related value it'd have to parse the expression again which would turn the value into some indeterminate state (running promise). So if we have an indeterminate state on a property isVisible we'd have to assume that it is false, right. This would cause a flickering form because every value change triggers recalculations of related isVisible fields