Move cursor so that it is in the text area, if possible.  May not
 be possible if cursor at end of line to the left of the text area.

 Move the text area displayed so that the cursor is on the screen.

  This method added to support Cut
  It removes the highlighted region from self.contents
  This cut was modeled after Emacs editor and therefore removes
  the carriage return at the end of lines so they are merged. 

draw(s, left_pos, yp, i)

  Added Editable Textlist version of draw

draw23(s, left_pos, yp, i, sx, ex, nc)

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  method to cut on just one line no vertical drag

  method to remove carriage return on the line before(forward drag)
  or after(backward drag). This will merge the two lines. 

  method to cut the highlighted regions of the first and last lines
  when more than one line is highlighted 
  set flag1 if drag on last line does not include the entire line.
  This will indicate that the carriage return on the previous line
  must be deleted so the lines will be merged and will behave like
  the Emacs Editor.

  method to cut the lines in the middle of the highlighted region

  get_max_width() allows for the actual line with the tabs

get_region(i)

  returns the string that is highlighted for each line of self.contents
  s is the line of self.contents and i is line number or y position
 

  method added to retieve a highlighted section swj 
  returns a list of strings for Copy
#

handle_end_of_line(e)

handle_key_down(e)

handle_key_end(e)

handle_key_home(e)

handle_key_left(e)

handle_key_page_down(e)

handle_key_page_up(e)

handle_key_right(e)

handle_key_up(e)

handle_map_pos(posx, pos_line2, tabpos)

 helper method for map_pos

 added to prevent reset of drag positions when ^x,^c,^v 

handle_press(e)

handle_redo(e)

 Redo the last undo. Only one redo allowed.
 Undo puts the last undo on the redolist so redo pulls
 it off and calls undo with a parameter no_redo so the
 redo does not get put on the redolist again.

handle_return(e, undo)

 Add tab character at cursor position and tab cursor

 The undo list is built for each event. This method gets the last
 item off the list and undos it using the same routines. A non-null
 parameter is passed to cut_selection, set_selection, and handle_return 
 so that these undo actions are not put back on the undo list. 

 

  This method returns the offset(or number of added blanks because
  of the tabs) up to the end position. If the use_selfcontents parameter is
  null then the number of blanks up to the position (endpos) in the
  actual line (the line with the blanks that is displayed) is returned.
  If  use_selfcontents is not null, then the number of blanks that would be  
  inserted up to the position (endpos) in self.contents is returned. 
  

select_all()

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set_cursor_y(n)

 Move cursor y to line n, and constrain x within range of that line.

  method added to support paste
  parameter s is a list of strings

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