Allow preview to work without explicit dependency on compose.uiTooling (#972)

Add runtime-only module org.jetbrains.compose.ui:ui-tooling-desktop
to preview classpath in configureDesktopPreview task

gradle-plugins/compose/src/main/kotlin/org/jetbrains/compose/desktop/preview/tasks/AbstractConfigureDesktopPreviewTask.kt

@@ -35,6 +35,11 @@ abstract class AbstractConfigureDesktopPreviewTask : AbstractComposeDesktopTask(
     internal val idePort: Provider<String>  =
         project.providers.gradleProperty("compose.desktop.preview.ide.port")
 
+    @get:InputFiles
+    internal val uiTooling = project.configurations.detachedConfiguration(
+        project.dependencies.create("org.jetbrains.compose.ui:ui-tooling-desktop:${ComposeBuildConfig.composeVersion}")
+    ).apply { isTransitive = false }
+
     @get:InputFiles
     internal val hostClasspath = project.configurations.detachedConfiguration(
         project.dependencies.create("org.jetbrains.compose:preview-rpc:${ComposeBuildConfig.composeVersion}")
@@ -44,9 +49,11 @@ abstract class AbstractConfigureDesktopPreviewTask : AbstractComposeDesktopTask(
     fun run() {
         val hostConfig = PreviewHostConfig(
                 javaExecutable = javaExecutable(javaHome.get()),
-                hostClasspath = hostClasspath.files.pathString()
+                hostClasspath = hostClasspath.files.asSequence().pathString()
             )
-        val previewClasspathString = previewClasspath.files.pathString()
+        val previewClasspathString =
+            (previewClasspath.files.asSequence() + uiTooling.files.asSequence())
+                .pathString()
 
         val gradleLogger = logger
         val previewLogger = GradlePreviewLoggerAdapter(gradleLogger)
@@ -65,7 +72,7 @@ abstract class AbstractConfigureDesktopPreviewTask : AbstractComposeDesktopTask(
         }
     }
 
-    private fun Collection<File>.pathString(): String =
+    private fun Sequence<File>.pathString(): String =
         joinToString(File.pathSeparator) { it.absolutePath }
 
     private class GradlePreviewLoggerAdapter(

idea-plugin/examples/simple-preview-example/mpp-jvm/build.gradle.kts

@@ -14,7 +14,6 @@ kotlin {
                 api(compose.runtime)
                 api(compose.foundation)
                 api(compose.material)
-                api(compose.uiTooling)
             }
         }
         named("desktopMain") {

idea-plugin/examples/simple-preview-example/pure-jvm/build.gradle.kts

@@ -7,6 +7,4 @@ plugins {
 
 dependencies {
     implementation(compose.desktop.currentOs)
-    // todo: remove after update
-    implementation(compose.uiTooling)
 }