Steps to Reproduce

1. Run attached fullfil.zul
2. Click "add dynamic item" 3 times
3. click "clear model" once
4. click "render all"

Current Result

onFullfill events trigger on the removed components.

each component onFullfil is triggered (1 + number of syncModel called after being added) times 

Expected Result

onFullfill doesn't trigger for removed components

onFullfill is called once per component which hold the listener

Debug Information

• org.zkoss.zk.ui.impl.UiEngineImpl.TemplateImpl.create(Component, Component, VariableResolver, Composer) is called on each of the items currently in the model everytime org.zkoss.zuti.zul.ForEachListDataListener.onChange(ListDataEvent) is triggered by adding new elements in the model.
• This triggers org.zkoss.zk.ui.impl.UiEngineImpl.execCreate(CreateInfo, NodeInfo, Component, Component) which adds new Fullfill listeners for every existing component, even those who already have a fullfill listener.
• Both issues should be solved by clearing fullfill listeners when the content of the shadow templates are destroyed and recreated during modelSync