Add audio clip preview refresh on asset reimport in Editor

Source/Editor/Viewport/Previews/AudioClipPreview.cs

@@ -37,6 +37,7 @@ namespace FlaxEditor.Viewport.Previews
 
         private readonly object _locker = new object();
         private AudioClip _asset;
+        private int _pcmSequence = 0;
         private float[] _pcmData;
         private AudioDataInfo _pcmInfo;
 
@@ -118,6 +119,22 @@ namespace FlaxEditor.Viewport.Previews
         /// </summary>
         public static readonly float UnitsPerSecond = 100.0f;
 
+        /// <summary>
+        /// Invalidates the cached audio PCM data and fetches it again from the asset.
+        /// </summary>
+        public void RefreshPreview()
+        {
+            lock (_locker)
+            {
+                // Release any cached data
+                _pcmData = null;
+
+                // Invalidate any in-flight data download to reject cached data due to refresh
+                if (_pcmSequence != 0)
+                    _pcmSequence++;
+            }
+        }
+
         /// <inheritdoc />
         public override void Draw()
         {
@@ -234,7 +251,13 @@ namespace FlaxEditor.Viewport.Previews
         /// </summary>
         private void DownloadData()
         {
-            var asset = _asset;
+            AudioClip asset;
+            int sequence;
+            lock (_locker)
+            {
+                asset = _asset;
+                sequence = _pcmSequence;
+            }
             if (!asset)
                 return;
 
@@ -259,8 +282,9 @@ namespace FlaxEditor.Viewport.Previews
             lock (_locker)
             {
                 // If asset has been modified during data fetching, ignore it
-                if (_asset == asset)
+                if (_asset == asset && _pcmSequence == sequence)
                 {
+                    _pcmSequence++;
                     _pcmData = data;
                     _pcmInfo = dataInfo;
                 }

Source/Editor/Windows/Assets/AudioClipWindow.cs

@@ -307,6 +307,7 @@ namespace FlaxEditor.Windows.Assets
                 _propertiesEditor.BuildLayout();
                 if (_previewSource)
                     _previewSource.Stop();
+                _preview.RefreshPreview();
 
                 // Setup
                 ClearEditedFlag();