add toggle to disable jar nesting in RemapJar tasks

src/main/java/net/fabricmc/loom/task/RemapJar.java

@@ -33,25 +33,31 @@ import java.io.File;
 
 public class RemapJar extends DefaultLoomTask {
 	public File jar;
-	public File backupTo;
+	public File destination;
+	public boolean nestJar;
 
 	@Input
 	public File getJar() {
 		return jar;
 	}
 
+	@Input
+	public boolean isNestJar() {
+		return nestJar;
+	}
+
 	@OutputFile
-	public File getBackupTo() {
-		if (backupTo == null) {
+	public File getDestination() {
+		if (destination == null) {
 			String s = jar.getAbsolutePath();
 			return new File(s.substring(0, s.length() - 4) + "-dev.jar");
 		}
 
-		return backupTo;
+		return destination;
 	}
 
 	@TaskAction
 	public void remap() {
-		ModRemapper.remap(this);
+		ModRemapper.remap(this, nestJar);
 	}
 }

src/main/java/net/fabricmc/loom/util/ModRemapper.java

@@ -42,7 +42,7 @@ import java.util.List;
 
 public class ModRemapper {
 
-	public static void remap(RemapJar task) {
+	public static void remap(RemapJar task, boolean nest) {
 		Project project = task.getProject();
 		LoomGradleExtension extension = project.getExtensions().getByType(LoomGradleExtension.class);
 
@@ -70,7 +70,7 @@ public class ModRemapper {
 		File modJarOutput = new File(s.substring(0, s.length() - 4) + ".remapped.jar");
 		Path modJarOutputPath = modJarOutput.toPath();
 
-		File modJarUnmappedCopy = task.getBackupTo();
+		File modJarUnmappedCopy = task.getDestination();
 		if (modJarUnmappedCopy.exists()) {
 			modJarUnmappedCopy.delete();
 		}
@@ -107,9 +107,11 @@ public class ModRemapper {
 			project.getLogger().debug("Transformed mixin reference maps in output JAR!");
 		}
 
+		if (nest) {
 			if (NestedJars.addNestedJars(project, modJarOutput)) {
 				project.getLogger().debug("Added nested jar paths to mod json");
 			}
+		}
 
 		try {
 			if (modJar.exists()) {