Fix video thubmnail being flipped in Compose

Closes #487

Packages/ComposeUI/Sources/ComposeUI/Controllers/AttachmentThumbnailController.swift

@@ -40,6 +40,7 @@ class AttachmentThumbnailController: ViewController {
             case .video, .gifv:
                 let asset = AVURLAsset(url: url)
                 let imageGenerator = AVAssetImageGenerator(asset: asset)
+                imageGenerator.appliesPreferredTrackTransform = true
                 #if os(visionOS)
                 #warning("Use async AVAssetImageGenerator.image(at:)")
                 #else
@@ -91,6 +92,7 @@ class AttachmentThumbnailController: ViewController {
             if type.conforms(to: .movie) {
                 let asset = AVURLAsset(url: url)
                 let imageGenerator = AVAssetImageGenerator(asset: asset)
+                imageGenerator.appliesPreferredTrackTransform = true
                 #if os(visionOS)
                 #warning("Use async AVAssetImageGenerator.image(at:)")
                 #else

Tusker/Screens/Gallery/VideoControlsViewController.swift

@@ -256,10 +256,8 @@ private class VideoScrubbingControl: UIControl {
     
     private func updateFillLayerMask() {
         // I don't know where this animation is coming from
-        CATransaction.begin()
-        CATransaction.setDisableActions(true)
         fillMaskLayer.frame = CGRect(x: 0, y: 0, width: fractionComplete * bounds.width, height: 8)
-        CATransaction.commit()
+        fillMaskLayer.removeAllAnimations()
     }
     
     override func beginTracking(_ touch: UITouch, with event: UIEvent?) -> Bool {