fix: Prevent potential infinite import loop (and polluted source control) due to the .ldtkc being written even if the contents don't change

Author: Cammin

Assets/LDtkUnity/Editor/Utility/Artifacts/LDtkConfigData.cs

@@ -1,5 +1,6 @@
 using System;
 using System.IO;
+using System.Linq;
 using System.Text;
 using UnityEditor;
 using UnityEngine;
@@ -29,6 +30,18 @@ internal string WriteJson(string projectAssetPath)
 
             LDtkPathUtility.TryCreateDirectoryForFile(writePath);
 
+            //Only write if the contents are actually changed! Otherwise, it's been observed to pollute source control, but also potentially results in an infinite import loop.
+            //The potential reason for an infinite loop is that the importer is triggered by the file being written, and it repeats each time.
+            //It's not good practice to write files to disk during a scripted importer, but it works for now.
+            if (File.Exists(writePath))
+            {
+                byte[] existingBytes = File.ReadAllBytes(writePath);
+                if (existingBytes.SequenceEqual(byteArray))
+                {
+                    return writePath;
+                }
+            }
+            
             File.WriteAllBytes(writePath, byteArray);
             return writePath;
         }