Simple category for changing window size to fit content

gistfile1.txt

- (void)resizeWindowForContentSize:(NSSize)size animated:(BOOL)animated {
    NSRect windowFrame = [self contentRectForFrameRect:[self frame]];
    NSRect newWindowFrame = [self frameRectForContentRect:
                             NSMakeRect( NSMinX( windowFrame ), NSMaxY( windowFrame ) - size.height, size.width, size.height )];
    [self setFrame:newWindowFrame display:YES animate:animated];
}