Avoid observing resizes when a node is invisible from the beginning

Author: zHaytam

src/Blazor.Diagrams/Components/Renderers/NodeRenderer.cs

@@ -1,6 +1,4 @@
-using System;
-using System.Text;
-using System.Threading.Tasks;
+using System.Text;
 using Blazor.Diagrams.Core.Extensions;
 using Blazor.Diagrams.Core.Geometry;
 using Blazor.Diagrams.Core.Models;
@@ -129,6 +127,9 @@ protected override void BuildRenderTree(RenderTreeBuilder builder)
 
     protected override async Task OnAfterRenderAsync(bool firstRender)
     {
+        if (firstRender && !Node.Visible)
+            return;
+
         if (firstRender || _becameVisible)
         {
             _becameVisible = false;

tests/Blazor.Diagrams.Tests/Components/NodeRendererTests.cs

@@ -0,0 +1,36 @@
+using Blazor.Diagrams.Components.Renderers;
+using Blazor.Diagrams.Core.Geometry;
+using Blazor.Diagrams.Core.Models;
+using Bunit;
+using Xunit;
+
+namespace Blazor.Diagrams.Tests.Components;
+
+public class NodeRendererTests
+{
+
+    [Fact]
+    public void NodeRenderer_WhenNodeVisibleIsFalseAndIsFirstRender_ShouldNotObserveResizes()
+    {
+        // Arrange
+        JSRuntimeInvocationHandler call;
+        using (var ctx = new TestContext())
+        {
+            ctx.JSInterop.Setup<Rectangle>("ZBlazorDiagrams.getBoundingClientRect", _ => true);
+            call = ctx.JSInterop.SetupVoid("ZBlazorDiagrams.observe", _ => true).SetVoidResult();
+
+            // Act
+            var cut = ctx.RenderComponent<NodeRenderer>(p =>
+            {
+                p.Add(n => n.BlazorDiagram, new BlazorDiagram());
+                p.Add(n => n.Node, new NodeModel()
+                {
+                    Visible = false
+                });
+            });
+        }
+
+        // Assert
+        call.VerifyNotInvoke("ZBlazorDiagrams.observe");
+    }
+}