findOptionalPanelFragmentContainerAndSetId
fun <VM : PanelSubContainerViewModel<SD>, SD> PanelContainerElementHolder.SubContainerHolder<VM, SD>.findOptionalPanelFragmentContainerAndSetId(panelFragmentContainerId: PanelFragmentContainerId, @IdRes stubId: Int): PanelFragmentContainerHolder?
Returns a PanelFragmentContainerHolder referencing the first matching FragmentContainerView in this panel sub-container. A FragmentContainerView is considered a match if its view ID matches the stubId.
Returns null
if no FragmentContainerView is found.
If the view is found, the panelFragmentContainerId is set as view id.