Add a way to specify that Forge is Mojang mapped

gradle.properties

@@ -5,5 +5,5 @@ loom_version_010Legacy=0.10.0.171
 loom_version_010=0.10.0.188
 loom_version_011=0.11.0.217
 loom_version_11=1.1.313
-transformer_version=5.2.83
+transformer_version=5.2.86
 base_version=3.4

src/main/kotlin/dev/architectury/plugin/ArchitecturyPluginExtension.kt

@@ -31,9 +31,10 @@ import java.util.jar.JarOutputStream
 import java.util.jar.Manifest
 
 open class ArchitectPluginExtension(val project: Project) {
-    var transformerVersion = "5.2.83"
+    var transformerVersion = "5.2.86"
     var injectablesVersion = "1.0.10"
     var minecraft = ""
+    internal var forgeUsesMojangMappings = false
     private var compileOnly = false
     var injectInjectables = true
     var addCommonMarker = true
@@ -116,6 +117,8 @@ open class ArchitectPluginExtension(val project: Project) {
             map[BuiltinProperties.MAPPINGS_WITH_SRG] = loom.tinyMappingsWithSrg.toString()
         }
 
+        map[BuiltinProperties.FORGE_FIX_MIXINS] = (!this.forgeUsesMojangMappings).toString()
+
         return map
     }
 
@@ -284,6 +287,7 @@ open class ArchitectPluginExtension(val project: Project) {
         val loaders: MutableSet<ModLoader> = LinkedHashSet(),
         val platformPackages: MutableMap<ModLoader, String> = mutableMapOf(),
         var isForgeLike: Boolean = false,
+        var forgeUsesMojangMappings : Boolean = false,
         val extraForgeLikeToNeoForgeRemaps: MutableMap<String, String> = mutableMapOf(),
     ) {
         constructor(loaders: Array<String>) : this() {
@@ -383,6 +387,7 @@ open class ArchitectPluginExtension(val project: Project) {
             it.loaders += ModLoader.FORGE
             action.execute(it)
         }
+        this.forgeUsesMojangMappings = settings.forgeUsesMojangMappings
 
         if (injectInjectables && !compileOnly) {
             var plsAddInjectables = false

src/main/kotlin/dev/architectury/plugin/ModLoader.kt

@@ -88,12 +88,15 @@ open class ModLoader(
                 add(RemapInjectables()) { file ->
                     this[BuiltinProperties.UNIQUE_IDENTIFIER] = projectGeneratedPackage(project, file)
                 }
-                this += AddRefmapName()
                 this += TransformPlatformOnly()
 
                 this += TransformForgeAnnotations()
                 this += TransformForgeEnvironment()
-                this += FixForgeMixin()
+
+                if (!(project.extensions.getByName("architectury") as ArchitectPluginExtension).forgeUsesMojangMappings) {
+                    this += AddRefmapName()
+                    this += FixForgeMixin()
+                }
 
                 loom.generateSrgTiny = true
             }