Start playing video attachments immediately on appear

Tusker/Screens/Attachment Gallery/GalleryPlayerViewController.swift

@@ -16,6 +16,8 @@ class GalleryPlayerViewController: UIViewController {
     
     var attachment: Attachment!
     
+    private var isFirstAppearance = true
+    
     override func viewDidLoad() {
         super.viewDidLoad()
         
@@ -44,6 +46,13 @@ class GalleryPlayerViewController: UIViewController {
         DispatchQueue.global(qos: .userInitiated).async {
             AudioSessionHelper.enable()
             AudioSessionHelper.setVideoPlayback()
+            
+            DispatchQueue.main.async {
+                if self.isFirstAppearance {
+                    self.isFirstAppearance = false
+                    self.playerVC.player?.play()
+                }
+            }
         }
     }