Fix various minor bugs

Session/Conversations/ConversationVC.swift

@@ -127,7 +127,7 @@ final class ConversationVC : BaseVC, ConversationViewModelDelegate, OWSConversat
         view.addSubview(messagesTableView)
         messagesTableView.pin(to: view)
         view.addSubview(scrollButton)
-        scrollButton.pin(.right, to: .right, of: view, withInset: -Values.mediumSpacing)
+        scrollButton.pin(.right, to: .right, of: view, withInset: -22)
         // Blocked banner
         addOrRemoveBlockedBanner()
         // Notifications
@@ -208,7 +208,7 @@ final class ConversationVC : BaseVC, ConversationViewModelDelegate, OWSConversat
         guard let newHeight = (notification.userInfo?[UIResponder.keyboardFrameEndUserInfoKey] as? NSValue)?.cgRectValue.size.height else { return }
         if !didConstrainScrollButton {
             // Bit of a hack to do this here, but it works out.
-            scrollButton.pin(.bottom, to: .bottom, of: view, withInset: -(newHeight + Values.mediumSpacing))
+            scrollButton.pin(.bottom, to: .bottom, of: view, withInset: -(newHeight + 22))
             didConstrainScrollButton = true
         }
         UIView.animate(withDuration: 0.25) {

Session/Conversations/Input View/InputView.swift

@@ -47,6 +47,7 @@ final class InputView : UIView, InputViewButtonDelegate, InputTextViewDelegate,
         let blurView = UIVisualEffectView(effect: UIBlurEffect(style: .regular))
         result.addSubview(blurView)
         blurView.pin(to: result)
+        result.alpha = 0
         return result
     }()
     
@@ -109,7 +110,7 @@ final class InputView : UIView, InputViewButtonDelegate, InputTextViewDelegate,
         mainStackView.pin([ UIView.HorizontalEdge.leading, UIView.HorizontalEdge.trailing ], to: self)
         mainStackView.pin(.bottom, to: .bottom, of: self, withInset: -2)
         // Mentions
-        addSubview(mentionsViewContainer)
+        insertSubview(mentionsViewContainer, belowSubview: mainStackView)
         mentionsViewContainer.pin([ UIView.HorizontalEdge.left, UIView.HorizontalEdge.right ], to: self)
         mentionsViewContainer.pin(.bottom, to: .top, of: self)
         mentionsViewContainer.addSubview(mentionsView)

Session/Conversations/Input View/InputViewButton.swift

@@ -37,6 +37,16 @@ final class InputViewButton : UIView {
     
     private func setUpViewHierarchy() {
         backgroundColor = .clear
+        if hasOpaqueBackground {
+            let backgroundView = UIView()
+            backgroundView.backgroundColor = isLightMode ? .white : .black
+            backgroundView.alpha = Values.lowOpacity
+            addSubview(backgroundView)
+            backgroundView.pin(to: self)
+            let blurView = UIVisualEffectView(effect: UIBlurEffect(style: .regular))
+            addSubview(blurView)
+            blurView.pin(to: self)
+        }
         backgroundView.backgroundColor = isSendButton ? Colors.accent : Colors.text.withAlphaComponent(0.05)
         addSubview(backgroundView)
         backgroundView.pin(to: self)