Fix crash with Gradle 7.4+ during idea sync.

src/main/java/net/fabricmc/loom/configuration/ide/idea/IdeaConfiguration.java

@@ -24,11 +24,14 @@
 
 package net.fabricmc.loom.configuration.ide.idea;
 
+import java.util.ArrayList;
 import java.util.List;
 
+import org.gradle.StartParameter;
+import org.gradle.TaskExecutionRequest;
 import org.gradle.api.Project;
 import org.gradle.api.tasks.TaskProvider;
-import org.gradle.execution.taskgraph.TaskExecutionGraphInternal;
+import org.gradle.internal.DefaultTaskExecutionRequest;
 
 import net.fabricmc.loom.task.LoomTasks;
 
@@ -42,8 +45,10 @@ public class IdeaConfiguration {
 			return;
 		}
 
-		// Run the idea sync task, is this exposed via the api?
-		final TaskExecutionGraphInternal taskGraph = (TaskExecutionGraphInternal) project.getGradle().getTaskGraph();
-		taskGraph.whenReady(taskExecutionGraph -> taskGraph.addEntryTasks(List.of(ideaSyncTask.get())));
+		final StartParameter startParameter = project.getGradle().getStartParameter();
+		final List<TaskExecutionRequest> taskRequests = new ArrayList<>(startParameter.getTaskRequests());
+
+		taskRequests.add(new DefaultTaskExecutionRequest(List.of("ideaSyncTask")));
+		startParameter.setTaskRequests(taskRequests);
 	}
 }

src/test/groovy/net/fabricmc/loom/test/LoomTestConstants.groovy

@@ -28,7 +28,7 @@ import org.gradle.util.GradleVersion
 
 class LoomTestConstants {
     public final static String DEFAULT_GRADLE = GradleVersion.current().getVersion()
-    public final static String PRE_RELEASE_GRADLE = "7.5-20220124231322+0000"
+    public final static String PRE_RELEASE_GRADLE = "7.5-20220129032445+0000"
 
     public final static String[] STANDARD_TEST_VERSIONS = [DEFAULT_GRADLE, PRE_RELEASE_GRADLE]
 }

src/test/groovy/net/fabricmc/loom/test/integration/RunConfigTest.groovy

@@ -27,7 +27,9 @@ package net.fabricmc.loom.test.integration
 import net.fabricmc.loom.test.util.GradleProjectTestTrait
 import spock.lang.Specification
 import spock.lang.Unroll
+import spock.util.environment.RestoreSystemProperties
 
+import static net.fabricmc.loom.test.LoomTestConstants.STANDARD_TEST_VERSIONS
 import static org.gradle.testkit.runner.TaskOutcome.SUCCESS
 
 // This test runs a mod that exits on mod init
@@ -52,4 +54,32 @@ class RunConfigTest extends Specification implements GradleProjectTestTrait {
 			'runTestmodServer'  | _
 			'runAutoTestServer' | _
 	}
+
+	@RestoreSystemProperties
+	@Unroll
+	def "idea auto configuration (gradle #version)"() {
+		setup:
+			System.setProperty("idea.sync.active", "true")
+			def gradle = gradleProject(project: "minimalBase", version: version)
+
+			new File(gradle.projectDir, ".idea").mkdirs()
+
+			gradle.buildGradle << '''
+                dependencies {
+                    minecraft "com.mojang:minecraft:1.18.1"
+                    mappings "net.fabricmc:yarn:1.18.1+build.18:v2"
+                    modImplementation "net.fabricmc:fabric-loader:0.12.12"
+                }
+            '''
+
+		when:
+			// Dont run with any tasks, the idea sync task should be invoked automatically due to the system prop
+			def result = gradle.run(tasks: [])
+
+		then:
+			result.task(":ideaSyncTask").outcome == SUCCESS
+
+		where:
+			version << STANDARD_TEST_VERSIONS
+	}
 }