KT-9875 False unused import in kotlinSpacingRules.kt

#KT-9875 Fixed

idea/src/org/jetbrains/kotlin/idea/imports/KotlinImportOptimizer.kt

@@ -136,8 +136,11 @@ public class KotlinImportOptimizer() : ImportOptimizer {
             val resolutionScope = place.getResolutionScope(bindingContext, place.getResolutionFacade())
             val noImportsScope = resolutionScope.replaceImportingScopes(null)
 
-            return isInScope(noImportsScope)
-                    || resolutionScope.getImplicitReceiversHierarchy().any { isInScope(it.type.memberScope.memberScopeAsImportingScope()) }
+            if (isInScope(noImportsScope)) return true
+            if (target !is ClassDescriptor) { // classes not accessible through receivers, only their constructors
+                if (resolutionScope.getImplicitReceiversHierarchy().any { isInScope(it.type.memberScope.memberScopeAsImportingScope()) }) return true
+            }
+            return false
         }
     }
 

idea/testData/editor/optimizeImports/KT9875.kt

@@ -0,0 +1,18 @@
+package p
+
+import p.Outer.Inner1
+import p.Outer.Inner2
+
+class Outer {
+    inner class Inner1
+    inner class Inner2
+}
+
+fun foo(p: Outer.() -> Unit){}
+
+fun bar() {
+    foo {
+        fun Inner1.f() {}
+        Inner2()
+    }
+}

idea/testData/editor/optimizeImports/KT9875.kt.after

@@ -0,0 +1,17 @@
+package p
+
+import p.Outer.Inner1
+
+class Outer {
+    inner class Inner1
+    inner class Inner2
+}
+
+fun foo(p: Outer.() -> Unit){}
+
+fun bar() {
+    foo {
+        fun Inner1.f() {}
+        Inner2()
+    }
+}

idea/tests/org/jetbrains/kotlin/idea/imports/OptimizeImportsTestGenerated.java

@@ -137,6 +137,12 @@ public class OptimizeImportsTestGenerated extends AbstractOptimizeImportsTest {
         doTest(fileName);
     }
 
+    @TestMetadata("KT9875.kt")
+    public void testKT9875() throws Exception {
+        String fileName = JetTestUtils.navigationMetadata("idea/testData/editor/optimizeImports/KT9875.kt");
+        doTest(fileName);
+    }
+
     @TestMetadata("KeywordNames.kt")
     public void testKeywordNames() throws Exception {
         String fileName = KotlinTestUtils.navigationMetadata("idea/testData/editor/optimizeImports/KeywordNames.kt");