Fixed bug with importing some of SAM-constructors and factory functions

#KT-3449 Fixed

idea/idea-analysis/src/org/jetbrains/kotlin/idea/util/ShortenReferences.kt

@@ -58,9 +58,23 @@ public class ShortenReferences(val options: (JetElement) -> Options = { Options.
                 = DescriptorRenderer.FQ_NAMES_IN_TYPES.render(this)
 
         private fun JetReferenceExpression.targets(context: BindingContext): Collection<DeclarationDescriptor> {
-            return context[BindingContext.REFERENCE_TARGET, this]?.let { listOf(it.getImportableDescriptor()) }
+            val targets = context[BindingContext.REFERENCE_TARGET, this]?.let { listOf(it) }
-                   ?: context[BindingContext.AMBIGUOUS_REFERENCE_TARGET, this]?.map { it.getImportableDescriptor() }?.toSet()
+                          ?: context[BindingContext.AMBIGUOUS_REFERENCE_TARGET, this]
-                   ?: listOf()
+                          ?: listOf()
+            return targets.map { descriptorToImport(it) }.toSet()
+        }
+
+        private fun descriptorToImport(target: DeclarationDescriptor): DeclarationDescriptor {
+            val descriptor = target.getImportableDescriptor()
+            // if there is a class with the same fq-name then prefer to consider it as target (otherwise we won't insert import)
+            if (descriptor is CallableDescriptor) {
+                val container = descriptor.getContainingDeclaration()
+                if (container is PackageFragmentDescriptor) {
+                    val classifier = container.getMemberScope().getClassifier(descriptor.getName())
+                    if (classifier != null) return classifier
+                }
+            }
+            return descriptor
         }
 
         private fun mayImport(descriptor: DeclarationDescriptor, file: JetFile): Boolean {

idea/testData/quickfix/autoImports/afterSAMConstructorFromLambda.kt

@@ -0,0 +1,11 @@
+// "Import" "true"
+import java.util.Collections
+import java.util.ArrayList
+import java.util.Comparator
+
+fun foo() {
+    Collections.sort(
+            ArrayList<Int>(),
+            <caret>Comparator {(x: Int, y: Int) -> x - y }
+    )
+}

idea/testData/quickfix/autoImports/beforeSAMConstructorFromLambda.kt

@@ -0,0 +1,10 @@
+// "Import" "true"
+import java.util.Collections
+import java.util.ArrayList
+
+fun foo() {
+    Collections.sort(
+            ArrayList<Int>(),
+            <caret>Comparator {(x: Int, y: Int) -> x - y }
+    )
+}

idea/testData/quickfix/autoImports/factoryFunctionFromLambda.after.kt

@@ -0,0 +1,8 @@
+// "Import" "true"
+// ERROR: Unresolved reference: XXX
+
+import ppp.XXX
+
+fun f() {
+    XXX { 1 }
+}

idea/testData/quickfix/autoImports/factoryFunctionFromLambda.before.Main.kt

@@ -0,0 +1,6 @@
+// "Import" "true"
+// ERROR: Unresolved reference: XXX
+
+fun f() {
+    <caret>XXX { 1 }
+}

idea/testData/quickfix/autoImports/factoryFunctionFromLambda.before.data.Sample.kt

@@ -0,0 +1,5 @@
+package ppp
+
+class XXX
+
+fun XXX(p: () -> Int){}

idea/testData/shortenRefs/constructor/SAMConstructorFromLambda.kt

@@ -0,0 +1,9 @@
+import java.util.Collections
+import java.util.ArrayList
+
+fun foo() {
+    Collections.sort(
+            ArrayList<Int>(),
+            <selection>java.util.Comparator</selection> {(x: Int, y: Int) -> x - y }
+    )
+}

idea/testData/shortenRefs/constructor/SAMConstructorFromLambda.kt.after

@@ -0,0 +1,10 @@
+import java.util.Collections
+import java.util.ArrayList
+import java.util.Comparator
+
+fun foo() {
+    Collections.sort(
+            ArrayList<Int>(),
+            Comparator {(x: Int, y: Int) -> x - y }
+    )
+}

idea/tests/org/jetbrains/kotlin/idea/quickfix/QuickFixMultiFileTestGenerated.java

@@ -92,6 +92,12 @@ public class QuickFixMultiFileTestGenerated extends AbstractQuickFixMultiFileTes
             doTestWithExtraFile(fileName);
         }
 
+        @TestMetadata("factoryFunctionFromLambda.before.Main.kt")
+        public void testFactoryFunctionFromLambda() throws Exception {
+            String fileName = JetTestUtils.navigationMetadata("idea/testData/quickfix/autoImports/factoryFunctionFromLambda.before.Main.kt");
+            doTestWithExtraFile(fileName);
+        }
+
         @TestMetadata("falsePostfixOperator.before.Main.kt")
         public void testFalsePostfixOperator() throws Exception {
             String fileName = JetTestUtils.navigationMetadata("idea/testData/quickfix/autoImports/falsePostfixOperator.before.Main.kt");

idea/tests/org/jetbrains/kotlin/idea/quickfix/QuickFixTestGenerated.java

@@ -412,6 +412,12 @@ public class QuickFixTestGenerated extends AbstractQuickFixTest {
             doTest(fileName);
         }
 
+        @TestMetadata("beforeSAMConstructorFromLambda.kt")
+        public void testSAMConstructorFromLambda() throws Exception {
+            String fileName = JetTestUtils.navigationMetadata("idea/testData/quickfix/autoImports/beforeSAMConstructorFromLambda.kt");
+            doTest(fileName);
+        }
+
         @TestMetadata("beforeUnresolvedReferenceInCall.kt")
         public void testUnresolvedReferenceInCall() throws Exception {
             String fileName = JetTestUtils.navigationMetadata("idea/testData/quickfix/autoImports/beforeUnresolvedReferenceInCall.kt");

idea/tests/org/jetbrains/kotlin/shortenRefs/ShortenRefsTestGenerated.java

@@ -147,6 +147,12 @@ public class ShortenRefsTestGenerated extends AbstractShortenRefsTest {
             doTest(fileName);
         }
 
+        @TestMetadata("SAMConstructorFromLambda.kt")
+        public void testSAMConstructorFromLambda() throws Exception {
+            String fileName = JetTestUtils.navigationMetadata("idea/testData/shortenRefs/constructor/SAMConstructorFromLambda.kt");
+            doTest(fileName);
+        }
+
         @TestMetadata("WorksForClassNameRange.kt")
         public void testWorksForClassNameRange() throws Exception {
             String fileName = JetTestUtils.navigationMetadata("idea/testData/shortenRefs/constructor/WorksForClassNameRange.kt");