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NAME
     DtEditorUndoEdit - undo the last edit made to the text in  a
     DtEditor widget

SYNOPSIS
     #include <Dt/Editor.h>
     Boolean DtEditorUndoEdit(Widget widget);

DESCRIPTION
     The  DtEditorUndoEdit()  function  undoes  the  last  change
     (deletion  or  insertion)  made  to  the  text in a DtEditor
     widget.  A change consists of either a  set  of  consecutive
     insertions, or a set of consecutive deletions followed by up
     to one set of consecutive insertions.  An insertion is  con-
     secutive if there have been no intervening deletions, and it
     is continuing forward from the same point.   A  deletion  is
     consecutive  if  there  have been no intervening insertions,
     and its start or end position is coincidental with the  last
     deletion  (that is, the deletion is continuing from the same
     point, either forward or backward).  Undoing  an  edit  once
     restores  the original text.  Undoing an edit twice restores
     the last change.

     The widget argument specifies the DtEditor widget ID.

     For a complete definition of the  DtEditor  widget  and  its
     associated resources, see DtEditor(3).

RETURN VALUE
     Upon successful completion, the DtEditorUndoEdit()  function
     returns  True;  otherwise,  if  there  is no pending undo it
     returns False.

SEE ALSO
     DtEditor(5), DtEditor(3).

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