base filter class


create 

run ( linebuffer )

destroy



PropFilter.Colourize ( LineBuff, LINEBUFF_SIZE,                              BlockEditor.SelectionStart() );  PropBuff,
Translator.Translate ( LineBuff, LINEBUFF_SIZE,                                                               PropBuff );                     
Trim                 ( LineBuff, MIN(LINEBUFF_SIZE, Editor.SelectionSize()), ScrollLoc.X ,                    (Display->Width - 1),  );