Improve logic to not run into invalid math.

rolfbjarne · rolfbjarne · commit d5ab674e70d7 · 2022-06-03T20:40:02.000+02:00
diff --git a/msbuild/Xamarin.MacDev.Tasks.Core/Tasks/CompileSceneKitAssetsTaskBase.cs b/msbuild/Xamarin.MacDev.Tasks.Core/Tasks/CompileSceneKitAssetsTaskBase.cs
@@ -199,8 +199,11 @@ public override bool Execute ()
 					// so we need to update the Link metadata accordingly (if it exists).
 					var link = scnassetsItem.GetMetadata ("Link");
 					if (!string.IsNullOrEmpty (link)) {
-						link = link.Substring (0, link.Length - (asset.ItemSpec.Length - scnassets.Length));
-						scnassetsItem.SetMetadata ("Link", link);
+						var newLinkLength =link.Length - (asset.ItemSpec.Length - scnassets.Length);
+						if (newLinkLength > 0 && newLinkLength < link.Length) {
+							link = link.Substring (0, newLinkLength);
+							scnassetsItem.SetMetadata ("Link", link);
+						}
 					}
 
 					var assetMetadata = asset.GetMetadata ("DefiningProjectFullPath");
