When saving a SwitchableField called 'switch', with its default transformer:

• Default selection is ignored (expected to save at least the 'switch' property to the name of the default selected option).
• Default value of the default selection is ignored (expected to save e.g. switchtext = myDefaultTextValue)
• Only when entering changes in one of the fields will then save all properties at once.

Hint: We mostly need to trigger transformer to write to the item on switchable selection changes (see selectionListener).

As a side note:

• There should be no preselection when using radio buttons, unless explicitly configured (option selected=true)
• For select dropdowns, in case there is no default preselection, field should behave like a native select, i.e. never be blank and show first option.
• Finally, we should save switchable field's subfields 'on demand' (currently it's just all at once).

------ Original description ------

Using info.magnolia.ui.form.field.definition.SwitchableFieldDefinition with hidden fields (see attached configuration) results in two bugs:

• original switch is not reflecting its default value which is not saved
• even when switch is set to reveal hidden fields their default values are ignored as well on save

Steps to reproduce using attached config:

• Open the dialog and save without any other action
  • default value of the SwitchableFieldDefinition should be saved but it's not
  • default values of hidden properties should be saved as well (in this case may be intention to not save them)
• Open the dialog, set the SwitchableFieldDefinition to true (which will result in revealing two other fields), then save
  • default value of SwitchableFieldDefinition is saved properly this time
  • however underlying properties are still ignored until modified