Non-imported extensions are excluded when shadowed by members or something

idea/idea-completion/src/org/jetbrains/kotlin/idea/completion/CompletionSession.kt

@@ -226,8 +226,7 @@ abstract class CompletionSessionBase(protected val configuration: CompletionSess
     protected fun getTopLevelExtensions(): Collection<CallableDescriptor> {
         val extensions = indicesHelper.getCallableTopLevelExtensions({ prefixMatcher.prefixMatches(it) }, reference!!.expression)
         //TODO: it filters out too much
-        //TODO: not filtered out dominated by members
-        return ShadowedDeclarationsFilter(bindingContext, moduleDescriptor, project, importDeclarations = true).filter(extensions, reference.expression)
+        return ShadowedDeclarationsFilter(bindingContext, moduleDescriptor, project).filterNonImported(extensions, referenceVariants, reference.expression)
     }
 
     protected fun addAllClasses(kindFilter: (ClassKind) -> Boolean) {

idea/idea-completion/testData/basic/multifile/PreferMemberToExtension/PreferMemberToExtension.dependency.kt

@@ -0,0 +1,3 @@
+package dependency
+
+fun Any.xxx(): Int = 1

idea/idea-completion/testData/basic/multifile/PreferMemberToExtension/PreferMemberToExtension.kt

@@ -0,0 +1,14 @@
+package ppp
+
+import dependency.*
+
+class C {
+    private fun xxx() {}
+
+    fun foo() {
+        xx<caret>
+    }
+}
+
+// EXIST: { lookupString: "xxx", itemText: "xxx", tailText: "()", typeText: "Unit" }
+// NOTHING_ELSE

idea/idea-completion/tests/org/jetbrains/kotlin/idea/completion/test/MultiFileJvmBasicCompletionTestGenerated.java

@@ -215,6 +215,12 @@ public class MultiFileJvmBasicCompletionTestGenerated extends AbstractMultiFileJ
         doTest(fileName);
     }
 
+    @TestMetadata("PreferMemberToExtension")
+    public void testPreferMemberToExtension() throws Exception {
+        String fileName = JetTestUtils.navigationMetadata("idea/idea-completion/testData/basic/multifile/PreferMemberToExtension/");
+        doTest(fileName);
+    }
+
     @TestMetadata("PreferMoreSpecificExtension1")
     public void testPreferMoreSpecificExtension1() throws Exception {
         String fileName = JetTestUtils.navigationMetadata("idea/idea-completion/testData/basic/multifile/PreferMoreSpecificExtension1/");