anchor.diff:      SplitHorz:= false;
       Splitted:= true;
       DoFileOpen_Ex(Ed2, AFileName2,
  +      AAllowLoadHistory,
         AAllowLoadHistory,
         AAllowLoadHistory,
         AAllowLexerDetect,
  
positive.code:   if AAllowLoadUndo then
      DoLoadUndo(Ed);
  
    DoLoadHistory(Ed, AAllowLoadHistoryEnc, AAllowLoadHistory, true);
  
    //save temp-options, to later know which options are changed,
    //during loading of lexer-specific config
  
negative.code:   DoFileOpen_Ex(Ed1, AFileName,
      AAllowLoadHistory,
      AAllowLoadHistory,
      AAllowLoadHistory,
      AAllowLexerDetect,
      AAllowErrorMsgBox,
      false,
  