Implemented by subclasses to move the selection or insertion point to the beginning of the line, expanding or reducing the current selection.
Original signature is '- (void)moveToBeginningOfLineAndModifySelection:(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)