Add "view once" tooltip.

SignalMessaging/ViewControllers/AttachmentApproval/AttachmentTextToolbar.swift

@@ -347,6 +347,20 @@ class AttachmentTextToolbar: UIView, UITextViewDelegate {
 
     // MARK: - Helpers
 
+    // The tooltip lies outside this view's bounds, so we
+    // need to special-case the hit testing so that it can
+    // intercept touches within its bounds.
+    @objc
+    public override func point(inside point: CGPoint, with event: UIEvent?) -> Bool {
+        if let viewOnceTooltip = self.viewOnceTooltip {
+            let tooltipFrame = convert(viewOnceTooltip.bounds, from: viewOnceTooltip)
+            if tooltipFrame.contains(point) {
+                return true
+            }
+        }
+        return super.point(inside: point, with: event)
+    }
+
     private var shouldShowViewOnceTooltip: Bool {
         guard FeatureFlags.viewOnceSending else {
             return false