proc toAutoFormMenu[T](app: T, sizeRequest: tuple[x,y: int] = (400, 700),
ignoreFields: static seq[string]): Widget =
  ## Provides a form for every field in a given `app` instance.
  ## The form is provided as a Popover that can be activated via a Menu-Button
  ## `ignoreFields` defines a list of field names to ignore for the form
generation.
  ## `sizeRequest` defines the requested size for the popover.
  ## Displays a dummy widget if there is no `toFormField` implementation for a
field with a custom type.
  var fieldWidgets: seq[Widget] = @[]
  const privateGeneralFields = ["app", "viewed", "stateRef"]
  for name, value in app[].fieldPairs:
    when name notin privateGeneralFields and name notin ignoreFields:
      let field: ptr = value.addr
      let fieldWidget = app.toFormField(field, name)
      fieldWidgets.add(fieldWidget)

  result = gui:
    MenuButton:
      icon = "document-properties"
      style = [ButtonFlat]

      Popover():
        Box(orient = OrientY):
          sizeRequest = sizeRequest
          ScrolledWindow:
            PreferencesGroup:
              title = "Fields"
              margin = 12

              for field in fieldWidgets:
                insert field
# Notice the `insert field`