Supress CS8974 for game projects & minor UI fixes to remove errors in Rider

- `CS8974` warnings is false-positive for Razor integration in Rider
- Minor bugfix for unreacheable path validation in NavigationHost
- Use `Panel` instead of `div` when `@ref` is required

Author: FylmTM

engine/Sandbox.Compiling/CompilerConfiguration.cs

@@ -24,7 +24,7 @@ public Configuration()
 
 		[Title( "Symbols" ), Description( "A list of pre-processor symbols to define when compiling, separated with semi-colons." )]
 		public string DefineConstants { get; set; } = "SANDBOX";
-		public string NoWarn { get; set; } = "1701;1702;1591;";
+		public string NoWarn { get; set; } = "1701;1702;1591;8974;";
 		public string WarningsAsErrors { get; set; } = "";
 		public bool TreatWarningsAsErrors { get; set; }
 		public bool Nullables { get; set; }

engine/Sandbox.SolutionGenerator/Templates/Project.Vars.cs

@@ -30,7 +30,7 @@ internal partial class Project
 	public string RootNamespace;
 	public string Nullable = "disable";
 	public string DefineConstants = "SANDBOX;DEBUG;TRACE";
-	public string NoWarn = "1701;1702;1591";
+	public string NoWarn = "1701;1702;1591;8974";
 	public string WarningsAsErrors = "";
 	public bool TreatWarningsAsErrors = false;
 	public bool IsEditorProject = false;

game/addons/base/.sbproj

@@ -18,7 +18,6 @@
     "Compiler": {
       "RootNamespace": "Sandbox",
       "DefineConstants": "SANDBOX;ADDON;DEBUG",
-      "NoWarn": "1701;1702;1591;",
       "TreatWarningsAsErrors": true
     }
   }

game/addons/base/code/UI/Components/NavigationHost.cs

@@ -113,7 +113,7 @@ public Panel Navigate( string url, bool redirectToDefault = true )
 		//
 		// Make url absolute by adding it to parent url
 		//
-		if ( url?.StartsWith( "~/" ) ?? false && parent.IsValid() )
+		if ( (url?.StartsWith( "~/" ) ?? false) && parent.IsValid() )
 		{
 			url = $"{parent.CurrentUrl}/{url[2..]}";
 		}

game/addons/base/code/UI/Controls/SliderControl.razor

@@ -21,20 +21,22 @@
             </div>
         }
 
-        <div @ref="TrackPanel" class="track">
-            <div class="track-active" style="width: @(SliderPosition)%;"></div>
-            <div @ref="ThumbPanel" style="left: @(SliderPosition)%;" class="thumb">
-
-                @if (this.HasActive)
-                {
-                    <div class="value-tooltip">
-                        <label>@Value.ToString( NumberFormat )</label>
-                        <div class="tail"></div>
-                    </div>
-                }
-
-            </div>
-        </div>
+        <Panel @ref="TrackPanel" class="track">
+            <ChildContent>
+                <div class="track-active" style="width: @(SliderPosition)%;"></div>
+                <Panel @ref="ThumbPanel" style="left: @(SliderPosition)%;" class="thumb">
+                    <ChildContent>
+                        @if (this.HasActive)
+                        {
+                            <div class="value-tooltip">
+                                <label>@Value.ToString( NumberFormat )</label>
+                                <div class="tail"></div>
+                            </div>
+                        }
+                    </ChildContent>
+                </Panel>
+            </ChildContent>
+        </Panel>
 
     </div>
 </root>