add debounced config save after 7 sec after window resizing/moving

Azaion.Annotator/Extensions/FuncExtensions.cs

@@ -0,0 +1,16 @@
+namespace Azaion.Annotator.Extensions;
+
+public static class FuncExtensions
+{
+    private static CancellationTokenSource? _lastCToken;
+
+    public static Action Debounce(this Action func, TimeSpan? throttleTime = null) =>
+        () =>
+        {
+            _lastCToken?.Cancel();
+
+            var tokenSrc = _lastCToken = new CancellationTokenSource();
+            Task.Delay(throttleTime ?? TimeSpan.FromMilliseconds(500), tokenSrc.Token)
+                .ContinueWith(_ => func(), tokenSrc.Token);
+        };
+}