Add the expectedBy dependency to the compile configuration

Enable its propagation through transitive dependencies (including
POMs generated by Gradle)

Issue #KT-22824 Fixed

libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/kotlin/org/jetbrains/kotlin/gradle/MultiplatformGradleIT.kt

@@ -201,4 +201,25 @@ class MultiplatformGradleIT : BaseGradleIT() {
             assertTasksExecuted(listOf(":lib:compileKotlinCommon", ":libJvm:compileKotlin", ":libJs:compileKotlin2Js"))
         }
     }
+
+    @Test
+    fun testCommonModuleAsTransitiveDependency() = with(Project("multiplatformProject")) {
+        setupWorkingDir()
+        gradleBuildScript("libJvm").appendText("""
+            ${'\n'}
+            task printCompileConfiguration(type: DefaultTask) {
+                doFirst {
+                    configurations.compile.resolvedConfiguration.resolvedArtifacts.each {
+                        println("Dependency: '" + it.name + "'")
+                    }
+                }
+            }
+            """.trimIndent())
+
+        build("printCompileConfiguration") {
+            assertSuccessful()
+            // Check that `lib` is contained in the resolved compile artifacts of `libJvm`:
+            assertContains("Dependency: 'lib'")
+        }
+    }
 }

libraries/tools/kotlin-gradle-plugin/src/main/kotlin/org/jetbrains/kotlin/gradle/plugin/KotlinMultiplatformPlugin.kt

@@ -72,6 +72,10 @@ open class KotlinPlatformImplementationPluginBase(platformName: String) : Kotlin
             config.dependencies.whenObjectAdded { dep ->
                 if (dep is ProjectDependency) {
                     addCommonProject(dep.dependencyProject, project)
+
+                    // Needed for the projects that depend on this one to recover the common module sources through
+                    // the transitive dependency (also, it will be added to the POM generated by Gradle):
+                    project.configurations.getByName("compile").dependencies.add(dep)
                 }
                 else {
                     throw GradleException("$project '${config.name}' dependency is not a project: $dep")