remove unused code, add comment

Signal/src/ViewControllers/ConversationView/ConversationInputTextView.m

@@ -72,6 +72,10 @@ NS_ASSUME_NONNULL_BEGIN
 
 - (void)setContentOffset:(CGPoint)contentOffset animated:(BOOL)isAnimated
 {
+    // When creating new lines, contentOffset is animated, but because because
+    // we are simultaneously resizing the text view, this can cause the
+    // text in the textview to be "too high" in the text view.
+    // Solution is to disable animation for setting content offset.
     [super setContentOffset:contentOffset animated:false];
 }
 

Signal/src/ViewControllers/ConversationView/ConversationInputToolbar.m

@@ -36,8 +36,6 @@ const CGFloat kMaxTextViewHeight = 98;
 @property (nonatomic, readonly) UIButton *sendButton;
 @property (nonatomic, readonly) UIButton *voiceMemoButton;
 
-@property (nonatomic) NSValue *lastTextContentSize;
-@property (nonatomic) CGFloat toolbarHeight;
 @property (nonatomic) CGFloat textViewHeight;
 @property (nonatomic, readonly) NSLayoutConstraint *textViewHeightConstraint;
 

SignalMessaging/attachments/AttachmentApprovalViewController.swift

@@ -537,7 +537,7 @@ class CaptioningToolbar: UIView, UITextViewDelegate {
         textView.addBorder(with: UIColor.lightGray)
         textView.font = UIFont.ows_dynamicTypeBody
         textView.returnKeyType = .done
-        textView.textContainerInset = UIEdgeInsets(top: 7, left: 7, bottom: 7, right: )
+        textView.textContainerInset = UIEdgeInsets(top: 7, left: 7, bottom: 7, right: 7)
         textView.scrollIndicatorInsets = UIEdgeInsets(top: 5, left: 0, bottom: 5, right: 3)
 
         let sendTitle = NSLocalizedString("ATTACHMENT_APPROVAL_SEND_BUTTON", comment: "Label for 'send' button in the 'attachment approval' dialog.")