Fix bug with member extensions with explicit receiver

Co-authored-by: Ilya Kirillov <ilya.kirillov@jetbrains.com>

idea/idea-completion/testData/basic/common/primitiveCompletion/classExtensionFunctionExplicitReceiver.kt

@@ -0,0 +1,11 @@
+class A {
+    fun Int.intExtFun() {}
+    val Int.intExtVal: Int get() = 0
+}
+
+fun usage() {
+    A().<caret>
+}
+
+// ABSENT: intExtFun
+// ABSENT: intExtVal

idea/idea-completion/testData/basic/common/primitiveCompletion/classFieldsAndFunctions.kt

@@ -2,6 +2,9 @@ class A {
     fun aa() {}
     val aaa = 10
 
+    fun Int.extFun() {}
+    fun Int.extVal() {}
+
     fun test() {
         <caret>
     }
@@ -9,3 +12,6 @@ class A {
 
 // EXIST: aa
 // EXIST: aaa
+// ESIST: test
+// ABSENT: extFun
+// ABSENT: extVal

idea/idea-completion/testData/basic/common/primitiveCompletion/implicitReceiverCompletion.kt

@@ -5,13 +5,10 @@ class A {
 
 fun A.run(action: A.() -> Unit) {}
 
-fun test(a: A) {
+fun test() {
+    val a = A()
     a.run {
-
         <caret>
-
-        // remove this
-        Unit
     }
 }
 

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

@@ -2227,6 +2227,11 @@ public class JSBasicCompletionTestGenerated extends AbstractJSBasicCompletionTes
                 KotlinTestUtils.assertAllTestsPresentByMetadataWithExcluded(this.getClass(), new File("idea/idea-completion/testData/basic/common/primitiveCompletion"), Pattern.compile("^(.+)\\.kt$"), null, true);
             }
 
+            @TestMetadata("classExtensionFunctionExplicitReceiver.kt")
+            public void testClassExtensionFunctionExplicitReceiver() throws Exception {
+                runTest("idea/idea-completion/testData/basic/common/primitiveCompletion/classExtensionFunctionExplicitReceiver.kt");
+            }
+
             @TestMetadata("classFieldsAndFunctions.kt")
             public void testClassFieldsAndFunctions() throws Exception {
                 runTest("idea/idea-completion/testData/basic/common/primitiveCompletion/classFieldsAndFunctions.kt");

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

@@ -2227,6 +2227,11 @@ public class JvmBasicCompletionTestGenerated extends AbstractJvmBasicCompletionT
                 KotlinTestUtils.assertAllTestsPresentByMetadataWithExcluded(this.getClass(), new File("idea/idea-completion/testData/basic/common/primitiveCompletion"), Pattern.compile("^(.+)\\.kt$"), null, true);
             }
 
+            @TestMetadata("classExtensionFunctionExplicitReceiver.kt")
+            public void testClassExtensionFunctionExplicitReceiver() throws Exception {
+                runTest("idea/idea-completion/testData/basic/common/primitiveCompletion/classExtensionFunctionExplicitReceiver.kt");
+            }
+
             @TestMetadata("classFieldsAndFunctions.kt")
             public void testClassFieldsAndFunctions() throws Exception {
                 runTest("idea/idea-completion/testData/basic/common/primitiveCompletion/classFieldsAndFunctions.kt");

idea/idea-frontend-fir/src/org/jetbrains/kotlin/idea/completion/KotlinFirCompletionContributor.kt

@@ -79,7 +79,8 @@ private object KotlinFirCompletionProvider : CompletionProvider<CompletionParame
             val typeContext = completionContext.session.typeContext
 
             if (explicitReceiverScope != null) {
-                yieldAll(explicitReceiverScope.collectCallableSymbols(packageIndexHelper))
+                val nonExtensionMembers = explicitReceiverScope.collectCallableSymbols(packageIndexHelper).filter { !it.isExtension }
+                yieldAll(nonExtensionMembers)
 
                 val allApplicableExtensions = allNonExplicitScopes
                     .flatMap { it.collectCallableSymbols(packageIndexHelper) }