Implemented by subclasses to move the selection or insertion point to the left end of the line, expanding or contracting the selection as required.
Original signature is '- (void)moveToLeftEndOfLineAndModifySelection:(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)