Re-added patch to enable stencil buffer in net.minecraft.client.shader.Framebuffer

Add test for the stencil buffer feature. Only tests that it doesn't crash when enabling, for now. - giga

src/test/java/net/minecraftforge/debug/client/rendering/StencilEnableTest.java

@@ -0,0 +1,18 @@
+package net.minecraftforge.debug.client.rendering;
+
+import net.minecraft.client.Minecraft;
+import net.minecraftforge.eventbus.api.Event;
+import net.minecraftforge.fml.common.Mod;
+import net.minecraftforge.fml.event.lifecycle.FMLClientSetupEvent;
+import net.minecraftforge.fml.javafmlmod.FMLJavaModLoadingContext;
+
+@Mod("stencil_enable_test")
+public class StencilEnableTest {
+    public StencilEnableTest() {
+        FMLJavaModLoadingContext.get().getModEventBus().addListener(this::clientSetup);
+    }
+
+    private void clientSetup(FMLClientSetupEvent event) {
+        Minecraft.getInstance().getFramebuffer().enableStencil();
+    }
+}