KT-34582 Exclude kotlin.coroutines.experimental package from completion and auto-import

- Exclusion happens only when `ReleaseCoroutines` feature is supported
- Add `LANGUAGE_VERSION` to few tests to make sure that previous exclusions still work when `experimental` package is not excluded entirely
- ^KT-34582 Fixed

idea/idea-completion/testData/basic/common/CoroutineContext.kt

@@ -2,5 +2,7 @@ suspend fun foo() {
     corou<caret>
 }
 
+// LANGUAGE_VERSION: 1.2
 // EXIST: {"lookupString":"coroutineContext","tailText":" (kotlin.coroutines.experimental)","typeText":"CoroutineContext","attributes":"","allLookupStrings":"coroutineContext, getCoroutineContext","itemText":"coroutineContext"}
+// ABSENT: {"lookupString":"coroutineContext","tailText":" (kotlin.coroutines)","typeText":"CoroutineContext","attributes":"","allLookupStrings":"coroutineContext, getCoroutineContext","itemText":"coroutineContext"}
 // ABSENT: {"lookupString":"coroutineContext","tailText":" (kotlin.coroutines.experimental.intrinsics)","typeText":"CoroutineContext","attributes":"","allLookupStrings":"coroutineContext, getCoroutineContext","itemText":"coroutineContext"}

idea/idea-completion/testData/basic/common/CoroutineContextReleaseCoroutines.kt

@@ -0,0 +1,7 @@
+suspend fun foo() {
+    corou<caret>
+}
+
+// ABSENT: {"lookupString":"coroutineContext","tailText":" (kotlin.coroutines.experimental)","typeText":"CoroutineContext","attributes":"","allLookupStrings":"coroutineContext, getCoroutineContext","itemText":"coroutineContext"}
+// EXIST: {"lookupString":"coroutineContext","tailText":" (kotlin.coroutines)","typeText":"CoroutineContext","attributes":"","allLookupStrings":"coroutineContext, getCoroutineContext","itemText":"coroutineContext"}
+// ABSENT: {"lookupString":"coroutineContext","tailText":" (kotlin.coroutines.experimental.intrinsics)","typeText":"CoroutineContext","attributes":"","allLookupStrings":"coroutineContext, getCoroutineContext","itemText":"coroutineContext"}

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

@@ -90,6 +90,11 @@ public class JSBasicCompletionTestGenerated extends AbstractJSBasicCompletionTes
             runTest("idea/idea-completion/testData/basic/common/CoroutineContext.kt");
         }
 
+        @TestMetadata("CoroutineContextReleaseCoroutines.kt")
+        public void testCoroutineContextReleaseCoroutines() throws Exception {
+            runTest("idea/idea-completion/testData/basic/common/CoroutineContextReleaseCoroutines.kt");
+        }
+
         @TestMetadata("DataClassMembers.kt")
         public void testDataClassMembers() throws Exception {
             runTest("idea/idea-completion/testData/basic/common/DataClassMembers.kt");

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

@@ -90,6 +90,11 @@ public class JvmBasicCompletionTestGenerated extends AbstractJvmBasicCompletionT
             runTest("idea/idea-completion/testData/basic/common/CoroutineContext.kt");
         }
 
+        @TestMetadata("CoroutineContextReleaseCoroutines.kt")
+        public void testCoroutineContextReleaseCoroutines() throws Exception {
+            runTest("idea/idea-completion/testData/basic/common/CoroutineContextReleaseCoroutines.kt");
+        }
+
         @TestMetadata("DataClassMembers.kt")
         public void testDataClassMembers() throws Exception {
             runTest("idea/idea-completion/testData/basic/common/DataClassMembers.kt");

idea/idea-core/src/org/jetbrains/kotlin/idea/core/excludedFromImportsAndCompletion.kt

@@ -7,8 +7,10 @@ package org.jetbrains.kotlin.idea.core
 
 import com.intellij.codeInsight.JavaProjectCodeInsightSettings
 import com.intellij.openapi.project.Project
+import org.jetbrains.kotlin.config.LanguageFeature
 import org.jetbrains.kotlin.descriptors.DeclarationDescriptor
 import org.jetbrains.kotlin.idea.imports.importableFqName
+import org.jetbrains.kotlin.idea.project.languageVersionSettings
 import org.jetbrains.kotlin.psi.KtFile
 
 
@@ -25,8 +27,19 @@ private val exclusions =
 private fun shouldBeHiddenAsInternalImplementationDetail(fqName: String, locationFqName: String) =
     exclusions.any { fqName.startsWith(it) } && (locationFqName.isBlank() || !fqName.startsWith(locationFqName))
 
+/**
+ * We do not want to show nothing from "kotlin.coroutines.experimental" when release coroutines are available,
+ * since in 1.3 this package is obsolete.
+ *
+ * However, we still want to show this package when release coroutines are not available.
+ */
+private fun usesOutdatedCoroutinesPackage(fqName: String, inFile: KtFile): Boolean =
+    fqName.startsWith("kotlin.coroutines.experimental.") &&
+            inFile.languageVersionSettings.supportsFeature(LanguageFeature.ReleaseCoroutines)
+
 fun DeclarationDescriptor.isExcludedFromAutoImport(project: Project, inFile: KtFile?): Boolean {
     val fqName = importableFqName?.asString() ?: return false
     return JavaProjectCodeInsightSettings.getSettings(project).isExcluded(fqName) ||
+            (inFile != null && usesOutdatedCoroutinesPackage(fqName, inFile)) ||
             shouldBeHiddenAsInternalImplementationDetail(fqName, inFile?.packageFqName?.asString() ?: "")
 }

idea/testData/quickfix/autoImports/excludedCoroutineImpl.kt

@@ -1,5 +1,6 @@
 // "Import" "false"
 // WITH_RUNTIME
+// LANGUAGE_VERSION: 1.2
 // ACTION: Create local variable 'CoroutineImpl'
 // ACTION: Create object 'CoroutineImpl'
 // ACTION: Create parameter 'CoroutineImpl'

idea/testData/quickfix/autoImports/excludedCoroutineIntrinsics.kt

@@ -1,5 +1,6 @@
 // "Import" "false"
 // WITH_RUNTIME
+// LANGUAGE_VERSION: 1.2
 // ACTION: Create function 'suspendCoroutineOrReturn'
 // ACTION: Rename reference
 // ERROR: Unresolved reference: suspendCoroutineOrReturn