Better default run config working directory

Author: Jonathing

src/main/groovy/net/minecraftforge/forgedev/tasks/launcher/SlimeLauncherOptions.java

@@ -47,7 +47,7 @@ default void with(SourceSet sourceSet, Action<? super SlimeLauncherOptionsNested
 
     /// The working directory to use.
     ///
-    /// By default, this will be `run/`{@link #getName() name}.
+    /// By default, this will be `run/`{@link SourceSet#getName() sourceSet}`/`{@link #getName() name}.
     ///
     /// To clarify: this is the working directory of the Java process. Slime Launcher uses absolute file locations to
     /// place its caches and metadata, which do not interfere with the working directory.

src/main/groovy/net/minecraftforge/forgedev/tasks/launcher/SlimeLauncherOptionsImpl.java

@@ -9,6 +9,7 @@
 import org.gradle.api.Action;
 import org.gradle.api.file.ConfigurableFileCollection;
 import org.gradle.api.file.DirectoryProperty;
+import org.gradle.api.file.ProjectLayout;
 import org.gradle.api.model.ObjectFactory;
 import org.gradle.api.provider.ListProperty;
 import org.gradle.api.provider.MapProperty;
@@ -39,6 +40,8 @@ public abstract class SlimeLauncherOptionsImpl implements SlimeLauncherOptionsIn
 
     private final MapProperty<String, SlimeLauncherOptionsNested> nested = this.getObjects().mapProperty(String.class, SlimeLauncherOptionsNested.class);
 
+    protected abstract @Inject ProjectLayout getProjectLayout();
+
     protected abstract @Inject ObjectFactory getObjects();
 
     protected abstract @Inject ProviderFactory getProviders();
@@ -267,7 +270,7 @@ public SlimeLauncherOptionsInternal inherit(Map<String, RunConfig> configs, Stri
         target.getMaxHeapSize().convention(this.getMaxHeapSize());
         target.getSystemProperties().convention(this.getSystemProperties());
         target.getEnvironment().convention(this.getEnvironment());
-        target.getWorkingDir().convention(this.getWorkingDir());
+        target.getWorkingDir().convention(this.getWorkingDir().orElse(getProjectLayout().getProjectDirectory().dir("runs/" + sourceSetName + '/' + this.name)));
         target.getClient().convention(this.getClient());
         return this.inherit(target, sourceSetName, configs, name);
     }
@@ -317,6 +320,8 @@ private SlimeLauncherOptionsInternal inherit(SlimeLauncherOptionsInternal target
             target.environment(child.getEnvironment().getOrElse(Map.of()));
 
             target.systemProperties(child.getSystemProperties().getOrElse(Map.of()));
+
+            target.getWorkingDir().set(child.getWorkingDir());
         }
 
         return target;