Simplify the scroll down button layout.
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@ -2595,7 +2595,7 @@ typedef enum : NSUInteger {
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{
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CGFloat inset = -(self.collectionView.contentInset.bottom + self.bottomLayoutGuide.length);
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self.scrollDownButtonButtomConstraint.constant = inset;
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[self.view setNeedsLayout];
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[self.scrollDownButton setNeedsLayout];
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}
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- (void)setHasUnreadMessages:(BOOL)hasUnreadMessages
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@ -3886,16 +3886,14 @@ typedef enum : NSUInteger {
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// RADAR: #36297652
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[self updateScrollDownButtonLayout];
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[self.scrollDownButton setNeedsLayout];
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[self.scrollDownButton layoutIfNeeded];
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// HACK: I've made the assumption that we are already in the context of an animation, in which case the
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// above should be sufficient to smoothly move the scrollDown button in step with the keyboard presentation
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// animation. Yet, setting the constraint doesn't animate the movement of the button - it "jumps" to it's final
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// position. So here we manually lay out the scroll down button frame (seemingly redundantly), which allows it
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// to be smoothly animated.
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CGRect newButtonFrame = self.scrollDownButton.frame;
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newButtonFrame.origin.y
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= self.scrollDownButton.superview.height - (newInsets.bottom + self.scrollDownButton.height);
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newButtonFrame.origin.y = self.scrollDownButton.superview.height
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- (newInsets.bottom + self.scrollDownButton.height + self.bottomLayoutGuide.length);
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self.scrollDownButton.frame = newButtonFrame;
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// Adjust content offset to prevent the presented keyboard from obscuring content.
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