Restore relative directories for Compose compiler metrics & reports

build-logic/convention/src/main/kotlin/com/google/samples/apps/nowinandroid/AndroidCompose.kt

@@ -53,13 +53,16 @@ internal fun Project.configureAndroidCompose(
 
     extensions.configure<ComposeCompilerGradlePluginExtension> {
         fun Provider<String>.onlyIfTrue() = flatMap { provider { it.takeIf(String::toBoolean) } }
+        fun Provider<*>.relativeToRootProject(dir: String) = flatMap {
+            rootProject.layout.buildDirectory.dir(projectDir.toRelativeString(rootDir))
+        }.map { it.dir(dir) }
 
-        project.providers.gradleProperty("enableComposeCompilerMetrics")
-            .onlyIfTrue().flatMap { rootProject.layout.buildDirectory.dir("compose-metrics") }
+        project.providers.gradleProperty("enableComposeCompilerMetrics").onlyIfTrue()
+            .relativeToRootProject("compose-metrics")
             .let(metricsDestination::set)
 
-        project.providers.gradleProperty("enableComposeCompilerReports")
-            .onlyIfTrue().flatMap { rootProject.layout.buildDirectory.dir("compose-reports") }
+        project.providers.gradleProperty("enableComposeCompilerReports").onlyIfTrue()
+            .relativeToRootProject("compose-reports")
             .let(reportsDestination::set)
 
         stabilityConfigurationFile = rootProject.layout.projectDirectory.file("compose_compiler_config.conf")