Revert "Try to detect sync and build phases within intellij and act accordingly to support both modes of compilation (gradle and intellij)."

This reverts commit 13e10eaae2.

gradle/ide/intellij-idea.gradle

@@ -15,46 +15,23 @@
  * limitations under the License.
  */
 
-// Try to detect IntelliJ model loader project structure "sync"
-//
-rootProject.ext.isIdea = Boolean.parseBoolean(System.getProperty("idea.active", "false"))
-rootProject.ext.isIdeaSync = Boolean.parseBoolean(System.getProperty("idea.sync.active", "false"))
-rootProject.ext.isIdeaBuild = (isIdea && !isIdeaSync)
+// Try to detect IntelliJ model loader ("reimport") early.
+rootProject.ext.isIdea = System.getProperty("idea.active") != null ||
+    gradle.startParameter.taskNames.contains('idea') ||
+    gradle.startParameter.taskNames.contains('cleanIdea')
 
 if (isIdea) {
   logger.warn("IntelliJ Idea IDE detected.")
+}
 
-  allprojects {
-    apply plugin: 'idea'
+allprojects {
+  apply plugin: 'idea'
 
-    idea {
-      module {
-        outputDir file('build/idea/classes/main')
-        testOutputDir file('build/idea/classes/test')
-        downloadSources = true
-      }
-    }
-  }
-}
-
-if (isIdeaBuild) {
-  // Skip certain long tasks that are dependencies
-  // of 'assemble' if we're building from within IntelliJ.
-  gradle.taskGraph.whenReady { taskGraph ->
-    def tasks = taskGraph.getAllTasks()
-
-    def skipTasks = [
-            // Skip site javadoc rendering
-            ".*:(renderSiteJavadoc)",
-    ]
-
-    logger.lifecycle("Skipping certain tasks on IntelliJ builds")
-    tasks.each { task ->
-      def taskPath = task.path
-      if (skipTasks.any { pattern -> taskPath ==~ pattern }) {
-        logger.debug("Skipping task on IntelliJ: " + taskPath)
-        task.enabled = false
-      }
+  idea {
+    module {
+      outputDir file('build/idea/classes/main')
+      testOutputDir file('build/idea/classes/test')
+      downloadSources = true
     }
   }
 }

gradle/java/modules.gradle

@@ -76,7 +76,7 @@ allprojects {
 
         // LUCENE-10304: if we modify the classpath here, IntelliJ no longer sees the dependencies as compile-time
         // dependencies, don't know why.
-        if (!rootProject.ext.isIdeaSync) {
+        if (!rootProject.ext.isIdea) {
           task.classpath = modularPaths.compilationClasspath
         }
 
@@ -119,7 +119,7 @@ allprojects {
 
     // LUCENE-10304: if we modify the classpath here, IntelliJ no longer sees the dependencies as compile-time
     // dependencies, don't know why.
-    if (!rootProject.ext.isIdeaSync) {
+    if (!rootProject.ext.isIdea) {
       def jarTask = project.tasks.getByName(mainSourceSet.getJarTaskName())
       def testJarTask = project.tasks.getByName(testSourceSet.getJarTaskName())