Fix loading indicator never disappearing when presenting gallery from status with >4 attachments

Packages/GalleryVC/Sources/GalleryVC/GalleryPresentationAnimationController.swift

@@ -109,8 +109,6 @@ class GalleryPresentationAnimationController: NSObject, UIViewControllerAnimated
             itemViewController.addContent()
             
             transitionContext.completeTransition(true)
-            
-            to.presentationAnimationCompleted()
         }
         
         animator.startAnimation()
@@ -132,8 +130,6 @@ class GalleryPresentationAnimationController: NSObject, UIViewControllerAnimated
         }
         animator.addCompletion { _ in
             transitionContext.completeTransition(!transitionContext.transitionWasCancelled)
-            
-            to.presentationAnimationCompleted()
         }
         animator.startAnimation()
     }

Packages/GalleryVC/Sources/GalleryVC/GalleryViewController.swift

@@ -68,6 +68,17 @@ public class GalleryViewController: UIPageViewController {
         setViewControllers([makeItemVC(index: initialItemIndex)], direction: .forward, animated: false)
     }
     
+    public override func viewDidAppear(_ animated: Bool) {
+        super.viewDidAppear(animated)
+        
+        if animated {
+            // Wait until the transition is no longer in-progress, otherwise things will just get deferred again.
+            DispatchQueue.main.async {
+                self.presentationAnimationCompleted()
+            }
+        }
+    }
+    
     public override func viewWillDisappear(_ animated: Bool) {
         super.viewWillDisappear(animated)