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Fixed on_erase, on_linkage_changed bug, added possibility to disable cloning,...

Libor Moravčík requested to merge xmoravc2-context-fixes into main

Fixed on_erase, on_linkage_changed bug, added possibility to disable cloning, added initialize_clone for clarity

  • Fixed sneaky bug that added empty set of handlers for either on_erase or on_linkage events that later prevented ContextItem destruction due to m_handlers were still containing an empty set of hanlders.
  • It is now possible to disable cloning by overriding clone method that returns a nullptr. Objects with such clone method defined won't be copied during copy operation.
  • Added initialize_clone method for clarity. By default the initialize_clone() method calls initalize() method to mimic the previous behaviour, e.g. initialize() is called after all objects has been copied. If user needs a better control and clarity, they can override initialize_clone() method.

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