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If the container() is NULL then this function works exactly like LineEdit::edit().<br />
If the container() is not NULL:
#If _help function exist it calls is the function passing MessageStatus::SetMessage and container()'s reference as arguments.
#Calls LineEdit's edit()
#If validation function exists and the terminating key of LineEdit'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 LineEdit'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
