DockItemT.release

This virtual method should remove @child from @self if the dock item knows how to do so. For example, the #DzlDockStack will remove @child from it's internal #GtkStack.

After the virtual function has been executed, child tracking will be removed so that #DzlDockItem implementations do not need to implement themselves.

template DockItemT(TStruct)
void
release

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