Cherry-pick fixes

Author: laktyushin

submodules/MediaPickerUI/Sources/MediaPickerScreen.swift

@@ -3050,13 +3050,17 @@ public final class MediaPickerScreenImpl: ViewController, MediaPickerScreen, Att
             }
         }
 
-        if let camera = self.controllerNode.modernCamera {
+        if let cameraView = self.controllerNode.cameraView {
+            if let previewView = cameraView.previewView(), previewView.isDescendant(of: cameraView) {
+                cameraView.stopPreview()
+            }
+        } else if let camera = self.controllerNode.modernCamera {
             if let cameraView = self.controllerNode.modernCameraView {
                 cameraView.isEnabled = false
             }
             camera.stopCapture(invalidate: true)
         }
-        
+
         super.dismiss(completion: completion)
     }