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→Method
If the container() is not NULL:
#If _help function exist, it calls the function passing MessageStatus::SetMessage and container()'s reference as arguments.
#Calls LineEditCLineEdit's edit()#If validation function exists, and the terminating key of LineEditCLineEdit's edit() is a navigation key(see below)#:It will call the validation function on the Field's _data, if the data is valid, it goes to next step, otherwise it will repeat calling LineEditCLineEdit's edit().
#After validation is done, if _help function exists, it will recall the help function using MessageStatus::ClearMessage and contianer()'s reference as arguments.
#It will return the terminating key
