strange hunk in buffer.slate patch

[Paul Dufresne]

In the following:

hunk ./src/lib/buffer.slate 79
-  n > b gapSize ifTrue: [error: 'The contents will not fit.'].
+  n <= (b gapSize + b size) ifTrue: [error: 'The contents will not fit.'].
}

I was asking myself if it was not supposed to be ifFalse: rathen than 
ifTrue: .
But I am not sure at all.