Convert to scope function: enable on single function call

#KT-29099 Fixed

idea/src/org/jetbrains/kotlin/idea/intentions/ConvertToScopeIntention.kt

@@ -111,7 +111,7 @@ sealed class ConvertToScopeIntention(
                 (prev + listOf(this) + next) to referenceName
             }
         }
-        if (targets.size < 2) return null
+        if (targets.isEmpty()) return null
         return targets to referenceName
     }
 

idea/testData/intentions/convertToScope/convertToAlso/callExpression5.kt

@@ -1,5 +1,4 @@
 // WITH_RUNTIME
-// IS_APPLICABLE: false
 
 class Foo {
     fun foo(i: Int) {}
@@ -11,6 +10,7 @@ fun test() {
     listOf(1).forEach {
         val f = Foo()<caret>
         f.foo(1)
+        f.foo(2)
         bar(it, f)
     }
 }

idea/testData/intentions/convertToScope/convertToAlso/callExpression5.kt.after

@@ -0,0 +1,17 @@
+// WITH_RUNTIME
+
+class Foo {
+    fun foo(i: Int) {}
+}
+
+fun bar(i: Int, f: Foo) {}
+
+fun test() {
+    listOf(1).forEach {
+        val f = Foo().also {
+            it.foo(1)
+            it.foo(2)
+        }
+        bar(it, f)
+    }
+}

idea/testData/intentions/convertToScope/convertToAlso/singleCall.kt

@@ -0,0 +1,10 @@
+// WITH_RUNTIME
+
+class C {
+    fun foo() {}
+}
+
+fun test() {
+    val c = C()
+    c.foo()<caret>
+}

idea/testData/intentions/convertToScope/convertToAlso/singleCall.kt.after

@@ -0,0 +1,11 @@
+// WITH_RUNTIME
+
+class C {
+    fun foo() {}
+}
+
+fun test() {
+    val c = C().also {
+        it.foo()
+    }
+}

idea/testData/intentions/convertToScope/convertToApply/callExpression5.kt

@@ -1,5 +1,4 @@
 // WITH_RUNTIME
-// IS_APPLICABLE: false
 
 class Foo {
     fun foo(i: Int) {}
@@ -7,6 +6,7 @@ class Foo {
     fun test(f: Foo) {
         val f = Foo()<caret>
         f.foo(1)
+        f.foo(2)
         bar(2, this)
     }
 }

idea/testData/intentions/convertToScope/convertToApply/callExpression5.kt.after

@@ -0,0 +1,15 @@
+// WITH_RUNTIME
+
+class Foo {
+    fun foo(i: Int) {}
+
+    fun test(f: Foo) {
+        val f = Foo().apply {
+            foo(1)
+            foo(2)
+        }
+        bar(2, this)
+    }
+}
+
+fun bar(i: Int, f: Foo) {}

idea/testData/intentions/convertToScope/convertToApply/singleCall.kt

@@ -0,0 +1,10 @@
+// WITH_RUNTIME
+
+class C {
+    fun foo() {}
+}
+
+fun test() {
+    val c = C()
+    c.foo()<caret>
+}

idea/testData/intentions/convertToScope/convertToApply/singleCall.kt.after

@@ -0,0 +1,11 @@
+// WITH_RUNTIME
+
+class C {
+    fun foo() {}
+}
+
+fun test() {
+    val c = C().apply {
+        foo()
+    }
+}

idea/testData/intentions/convertToScope/convertToRun/methodChainWithThisParameter.kt

@@ -1,5 +1,4 @@
 // WITH_RUNTIME
-// IS_APPLICABLE: false
 
 class MyClass {
     fun foo1(a: MyClass): MyClass = this
@@ -9,5 +8,7 @@ class MyClass {
     fun foo4(a: MyClass) {
         a.foo1(this).foo2().foo3()
         a.foo2()<caret>
+        a.foo3()
+        a.foo1(this).foo2().foo3()
     }
 }

idea/testData/intentions/convertToScope/convertToRun/methodChainWithThisParameter.kt.after

@@ -0,0 +1,16 @@
+// WITH_RUNTIME
+
+class MyClass {
+    fun foo1(a: MyClass): MyClass = this
+    fun foo2(): MyClass = this
+    fun foo3(): MyClass = this
+
+    fun foo4(a: MyClass) {
+        a.foo1(this).foo2().foo3()
+        a.run {
+            foo2()
+            foo3()
+        }
+        a.foo1(this).foo2().foo3()
+    }
+}

idea/testData/intentions/convertToScope/convertToRun/singleCall.kt

@@ -0,0 +1,10 @@
+// WITH_RUNTIME
+
+class C {
+    fun foo() {}
+}
+
+fun test() {
+    val c = C()
+    c.foo()<caret>
+}

idea/testData/intentions/convertToScope/convertToRun/singleCall.kt.after

@@ -0,0 +1,12 @@
+// WITH_RUNTIME
+
+class C {
+    fun foo() {}
+}
+
+fun test() {
+    val c = C()
+    c.run {
+        foo()
+    }
+}

idea/testData/intentions/convertToScope/convertToWith/methodChainWithThisParameter.kt

@@ -1,5 +1,4 @@
 // WITH_RUNTIME
-// IS_APPLICABLE: false
 
 class MyClass {
     fun foo1(a: MyClass): MyClass = this
@@ -9,5 +8,7 @@ class MyClass {
     fun foo4(a: MyClass) {
         a.foo1(this).foo2().foo3()
         a.foo2()<caret>
+        a.foo3()
+        a.foo1(this).foo2().foo3()
     }
 }

idea/testData/intentions/convertToScope/convertToWith/methodChainWithThisParameter.kt.after

@@ -0,0 +1,16 @@
+// WITH_RUNTIME
+
+class MyClass {
+    fun foo1(a: MyClass): MyClass = this
+    fun foo2(): MyClass = this
+    fun foo3(): MyClass = this
+
+    fun foo4(a: MyClass) {
+        a.foo1(this).foo2().foo3()
+        with(a) {
+            foo2()
+            foo3()
+        }
+        a.foo1(this).foo2().foo3()
+    }
+}

idea/testData/intentions/convertToScope/convertToWith/singleCall.kt

@@ -0,0 +1,10 @@
+// WITH_RUNTIME
+
+class C {
+    fun foo() {}
+}
+
+fun test() {
+    val c = C()
+    c.foo()<caret>
+}

idea/testData/intentions/convertToScope/convertToWith/singleCall.kt.after

@@ -0,0 +1,12 @@
+// WITH_RUNTIME
+
+class C {
+    fun foo() {}
+}
+
+fun test() {
+    val c = C()
+    with(c) {
+        foo()
+    }
+}

idea/tests/org/jetbrains/kotlin/idea/intentions/IntentionTestGenerated.java

@@ -7553,6 +7553,11 @@ public class IntentionTestGenerated extends AbstractIntentionTest {
                 runTest("idea/testData/intentions/convertToScope/convertToAlso/onProperty.kt");
             }
 
+            @TestMetadata("singleCall.kt")
+            public void testSingleCall() throws Exception {
+                runTest("idea/testData/intentions/convertToScope/convertToAlso/singleCall.kt");
+            }
+
             @TestMetadata("untilItParameter.kt")
             public void testUntilItParameter() throws Exception {
                 runTest("idea/testData/intentions/convertToScope/convertToAlso/untilItParameter.kt");
@@ -7641,6 +7646,11 @@ public class IntentionTestGenerated extends AbstractIntentionTest {
                 runTest("idea/testData/intentions/convertToScope/convertToApply/onProperty.kt");
             }
 
+            @TestMetadata("singleCall.kt")
+            public void testSingleCall() throws Exception {
+                runTest("idea/testData/intentions/convertToScope/convertToApply/singleCall.kt");
+            }
+
             @TestMetadata("thisParameter.kt")
             public void testThisParameter() throws Exception {
                 runTest("idea/testData/intentions/convertToScope/convertToApply/thisParameter.kt");
@@ -7744,6 +7754,11 @@ public class IntentionTestGenerated extends AbstractIntentionTest {
                 runTest("idea/testData/intentions/convertToScope/convertToRun/onProperty.kt");
             }
 
+            @TestMetadata("singleCall.kt")
+            public void testSingleCall() throws Exception {
+                runTest("idea/testData/intentions/convertToScope/convertToRun/singleCall.kt");
+            }
+
             @TestMetadata("thisParameter.kt")
             public void testThisParameter() throws Exception {
                 runTest("idea/testData/intentions/convertToScope/convertToRun/thisParameter.kt");
@@ -7842,6 +7857,11 @@ public class IntentionTestGenerated extends AbstractIntentionTest {
                 runTest("idea/testData/intentions/convertToScope/convertToWith/onProperty.kt");
             }
 
+            @TestMetadata("singleCall.kt")
+            public void testSingleCall() throws Exception {
+                runTest("idea/testData/intentions/convertToScope/convertToWith/singleCall.kt");
+            }
+
             @TestMetadata("thisParameter.kt")
             public void testThisParameter() throws Exception {
                 runTest("idea/testData/intentions/convertToScope/convertToWith/thisParameter.kt");