Move scroll logic to KeyboardAvoider

Riot/Modules/Common/KeyboardAvoiding/KeyboardAvoider.swift

@@ -56,6 +56,21 @@ final class KeyboardAvoider: NSObject {
         self.unregisterKeyboardNotifications()
     }
     
+    /// Scroll to the given view, which must be a view in the scrollView.
+    /// - Parameters:
+    ///   - view: The view to scroll
+    ///   - animated: animate the scroll
+    func scroll(to view: UIView, animated: Bool = true) {
+        guard let scrollView = scrollView else { return }
+        //  find the view's frame in the scrollView
+        var rect = view.convert(view.frame, to: scrollView)
+        //  add a little offset to also see some below/above of the view
+        rect = rect.insetBy(dx: 0, dy: -20)
+        DispatchQueue.main.async {
+            scrollView.scrollRectToVisible(rect, animated: animated)
+        }
+    }
+    
     // MARK: - Private
     
     private func registerKeyboardNotifications() {