Wrong bubble width on iPad, iOS 9

[oanaBan]

When accessing Messages room with storyboard on iPad with iOS 9 (on both latest version of master branch and develop branch) the bubble width is wrong. Pls see the attached image.

This is not repro on iOS 8.

[harlanhaskins]

I've noticed this in some weird cases, too. Are there any constraint errors that pop up when this happens?

[Yostra]

when you go to split view on iPad air 2, same thing happens

[harlanhaskins]

Looking at this now, we really should respond to -[UIViewController viewWillTransitionToSize:withTransitionCoordinator:] and -[UIViewController traitCollectionDidChange:].

This makes the split screen multitasking work nicely:

- (void)resetLayoutAndCaches {
    JSQMessagesCollectionViewFlowLayoutInvalidationContext *context = [JSQMessagesCollectionViewFlowLayoutInvalidationContext context];
    context.invalidateFlowLayoutMessagesCache = YES;
    [self.collectionView.collectionViewLayout invalidateLayoutWithContext:context];
}
-(void)viewWillTransitionToSize:(CGSize)size withTransitionCoordinator:(id<UIViewControllerTransitionCoordinator>)coordinator {
    [super viewWillTransitionToSize:size withTransitionCoordinator:coordinator];
    [self resetLayoutAndCaches];
}

- (void)traitCollectionDidChange:(UITraitCollection *)previousTraitCollection {
    [super traitCollectionDidChange:previousTraitCollection];
    [self resetLayoutAndCaches];
}

PR Incoming! @jessesquires.