gtk:editable-position (editable)

editable -- a gtk:editable widget
pos -- an integer for the position of the cursor, in chars

Gets or sets the position of the cursor relative to the start of the content of the editable widget. The cursor is displayed before the character with the given (base 0) index in the contents of the editable widget. The value must be less than or equal to the number of characters in the editable widget. A value of -1 indicates that the position should be set after the last character of the editable widget. Note that pos is in characters, not in bytes. The cursor-position slot is not writable. Use this function to set the cursor position of the editable widget.