Switch to IJP 242 EAP

This in turn requires:
1. Updating Kotlin to 1.9.24 (matching the bundled version)
2. Updating the IJP Gradle plugin to 2.0 (beta)
3. Updating Gradle (not mandatory, but why not)
4. Updating Compose to 1.6.20-dev1646
5. Reworking the IDE sample build.gradle.kts in the new 2.0 syntax
6. Bumping the JBR version to 21

buildSrc/src/main/kotlin/jewel.gradle.kts

@@ -19,14 +19,14 @@ version = when {
 java {
     toolchain {
         vendor = JvmVendorSpec.JETBRAINS
-        languageVersion = JavaLanguageVersion.of(17)
+        languageVersion = JavaLanguageVersion.of(21)
     }
 }
 
 kotlin {
     jvmToolchain {
         vendor = JvmVendorSpec.JETBRAINS
-        languageVersion = JavaLanguageVersion.of(17)
+        languageVersion = JavaLanguageVersion.of(21)
     }
 
     target {

buildSrc/src/main/kotlin/org/jetbrains/jewel/buildlogic/demodata/AndroidStudioReleases.kt

@@ -1,8 +1,8 @@
 package org.jetbrains.jewel.buildlogic.demodata
 
 import com.squareup.kotlinpoet.ClassName
-import gradle.kotlin.dsl.accessors._191c70c30b85215d3734a2125d755542.main
-import gradle.kotlin.dsl.accessors._191c70c30b85215d3734a2125d755542.sourceSets
+import gradle.kotlin.dsl.accessors._2568f72cb9e4ce984c7f1bb76d889841.main
+import gradle.kotlin.dsl.accessors._2568f72cb9e4ce984c7f1bb76d889841.sourceSets
 import kotlinx.serialization.json.Json
 import kotlinx.serialization.json.decodeFromStream
 import org.gradle.api.DefaultTask

gradle.properties

@@ -6,5 +6,5 @@ kotlin.stdlib.default.dependency=false
 # See https://jb.gg/intellij-platform-kotlin-oom
 kotlin.incremental.useClasspathSnapshot=false
 
-ijp.target=241
+ijp.target=242
 jewel.release.version=0.19.3

gradle/libs.versions.toml

@@ -1,12 +1,12 @@
 [versions]
 commonmark = "0.22.0"
-composeDesktop = "1.6.10-dev1584"
+composeDesktop = "1.6.20-dev1646"
 detekt = "1.23.4"
 dokka = "1.8.20"
-idea = "241.17011.79"
-ideaGradlePlugin = "1.17.1"
+idea = "242.10180.25-EAP-SNAPSHOT"
+ideaGradlePlugin = "2.0.0-beta2"
 jna = "5.14.0"
-kotlin = "1.8.21"
+kotlin = "1.9.24"
 kotlinSarif = "0.5.0"
 kotlinpoet = "1.15.2"
 kotlinterGradlePlugin = "3.16.0"
@@ -46,7 +46,7 @@ idea = ["ij-platform-ide-core", "ij-platform-ide-impl", "ij-platform-core-ui"]
 composeDesktop = { id = "org.jetbrains.compose", version.ref = "composeDesktop" }
 detekt = { id = "io.gitlab.arturbosch.detekt", version.ref = "detekt" }
 dokka = { id = "org.jetbrains.dokka", version.ref = "dokka" }
-ideaGradlePlugin = { id = "org.jetbrains.intellij", version.ref = "ideaGradlePlugin" }
+ideaGradlePlugin = { id = "org.jetbrains.intellij.platform", version.ref = "ideaGradlePlugin" }
 kotlinJvm = { id = "org.jetbrains.kotlin.jvm", version.ref = "kotlin" }
 kotlinx-binaryCompatValidator = { id = "org.jetbrains.kotlinx.binary-compatibility-validator", version.ref = "kotlinxBinaryCompat" }
 kotlinx-serialization = { id = "org.jetbrains.kotlin.plugin.serialization", version.ref = "kotlin" }

gradle/wrapper/gradle-wrapper.properties

@@ -1,5 +1,5 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-8.6-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.7-all.zip
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists

samples/ide-plugin/build.gradle.kts

@@ -5,24 +5,18 @@ plugins {
     `android-studio-releases-generator`
 }
 
-intellij {
-    pluginName = "Jewel Demo"
-    plugins = listOf("org.jetbrains.kotlin")
-    version = libs.versions.idea.get()
-}
-
-// TODO remove this once the IJ Gradle plugin fixes their repositories bug
-// See https://github.com/JetBrains/gradle-intellij-plugin/issues/776
 repositories {
-    maven("https://maven.pkg.jetbrains.space/public/p/compose/dev")
-    maven("https://www.jetbrains.com/intellij-repository/releases")
-    maven("https://cache-redirector.jetbrains.com/intellij-dependencies")
-    google()
-    mavenCentral()
-
+    intellijPlatform {
+        defaultRepositories()
+    }
 }
 
 dependencies {
+    intellijPlatform {
+        intellijIdeaCommunity(libs.versions.idea)
+//        bundledPlugins("org.jetbrains.kotlin")
+    }
+
     implementation(projects.ideLafBridge) {
         exclude(group = "org.jetbrains.kotlinx")
     }
@@ -37,6 +31,10 @@ dependencies {
     }
 }
 
+intellijPlatform {
+    pluginConfiguration { name = "Jewel Demo" }
+}
+
 tasks {
     // We don't have any settings in the demo plugin
     buildSearchableOptions {