Implemented by subclasses to move the selection or insertion point to the left end of the line.
Original signature is '- (void)moveToLeftEndOfLine:(id)sender'
Available in Mac OS X v10.6 and later.


- sender (Id)
- Typically the object that invoked this method.

- Available in Monobjc Bridge: 10.6 (For Mac OS X 10.6 and later)