Forces the receiver to perform layout for the specified character range, if it has not already done so.
Original signature is '- (void)ensureLayoutForCharacterRange:(NSRange)charRange'
Available in Mac OS X v10.5 and later.


- charRange (NSRange)
- The character range for which layout is performed.

- Available in Monobjc Bridge: 10.6 (For Mac OS X 10.6 and later), 10.5 (For Mac OS X 10.5 and later)