Configure Kotlin: do not show notification when apply directive contains double quotes

idea/src/org/jetbrains/kotlin/idea/configuration/KotlinWithGradleConfigurator.java

@@ -81,7 +81,13 @@ public abstract class KotlinWithGradleConfigurator implements KotlinProjectConfi
 
     private boolean isFileConfigured(GroovyFile projectGradleFile) {
         String fileText = projectGradleFile.getText();
-        return fileText.contains(getApplyPluginDirective()) && fileText.contains(LIBRARY);
+        return containsDirective(fileText, getApplyPluginDirective()) && fileText.contains(LIBRARY);
+    }
+
+    private static boolean containsDirective(@NotNull String fileText, @NotNull String directive) {
+        return fileText.contains(directive)
+               || fileText.contains(directive.replace("\"", "'"))
+               || fileText.contains(directive.replace("'", "\""));
     }
 
     @Override
@@ -160,7 +166,8 @@ public abstract class KotlinWithGradleConfigurator implements KotlinProjectConfi
 
                     String dependencyString = String.format(
                             "%s \"%s:%s:%s\"",
-                            groovyScope, libraryDescriptor.getLibraryGroupId(), libraryDescriptor.getLibraryArtifactId(), libraryDescriptor.getMaxVersion());
+                            groovyScope, libraryDescriptor.getLibraryGroupId(), libraryDescriptor.getLibraryArtifactId(),
+                            libraryDescriptor.getMaxVersion());
 
                     GrClosableBlock dependenciesBlock = getDependenciesBlock(gradleFile);
                     addLastExpressionInBlockIfNeeded(dependencyString, dependenciesBlock);
@@ -228,7 +235,7 @@ public abstract class KotlinWithGradleConfigurator implements KotlinProjectConfi
     protected boolean addElementsToModuleFile(@NotNull GroovyFile file, @NotNull String version) {
         boolean wasModified = false;
 
-        if (!file.getText().contains(getApplyPluginDirective())) {
+        if (!containsDirective(file.getText(), getApplyPluginDirective())) {
             GrExpression apply = GroovyPsiElementFactory.getInstance(file.getProject()).createExpressionFromText(getApplyPluginDirective());
             GrApplicationStatement applyStatement = getApplyStatement(file);
             if (applyStatement != null) {

idea/testData/configuration/gradle/plugin_present_after.gradle

@@ -0,0 +1,26 @@
+apply plugin: "java"
+apply plugin: "kotlin"
+
+sourceCompatibility = 1.5
+version = '1.0'
+
+dependencies {
+    testCompile group: 'junit', name: 'junit', version: '4.11'
+    compile "org.jetbrains.kotlin:kotlin-stdlib:$kotlin_version"
+}
+
+buildscript {
+    ext.kotlin_version = '$VERSION$'
+    repositories {
+        mavenCentral()
+    }
+    dependencies {
+        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
+    }
+}
+sourceSets {
+    main.java.srcDirs += 'src/main/kotlin'
+}
+repositories {
+    mavenCentral()
+}

idea/testData/configuration/gradle/plugin_present_before.gradle

@@ -0,0 +1,21 @@
+apply plugin: "java"
+apply plugin: "kotlin"
+
+sourceCompatibility = 1.5
+version = '1.0'
+
+dependencies {
+    testCompile group: 'junit', name: 'junit', version: '4.11'
+}
+
+buildscript {
+    repositories {
+        mavenCentral()
+    }
+    dependencies {
+        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
+    }
+}
+sourceSets {
+    main.java.srcDirs += 'src/main/kotlin'
+}

idea/tests/org/jetbrains/kotlin/idea/configuration/ConfigureProjectByChangingFileTestGenerated.java

@@ -48,6 +48,12 @@ public class ConfigureProjectByChangingFileTestGenerated extends AbstractConfigu
             String fileName = KotlinTestUtils.navigationMetadata("idea/testData/configuration/gradle/missedLibrary_before.gradle");
             doTestGradle(fileName);
         }
+
+        @TestMetadata("plugin_present_before.gradle")
+        public void testPlugin_present() throws Exception {
+            String fileName = KotlinTestUtils.navigationMetadata("idea/testData/configuration/gradle/plugin_present_before.gradle");
+            doTestGradle(fileName);
+        }
     }
 
     @TestMetadata("idea/testData/configuration/maven")