If the RETURN-INSERTED attribute is TRUE, a RETURN event inserts a hard return at the cursor position, breaking the current line. Otherwise, if the editor is in a dialog box with a default button, a RETURN event chooses the default button for the dialog box. If the editor is not in a dialog box with a default button, a RETURN event inserts a hard return for any value of RETURN-INSERTED. The default value is FALSE.
You can set this attribute only before the editor widget is realized.
