Upgrade Gradle to 6.3 and upgrade plugins

Author: filiphr

build.gradle

@@ -1,7 +1,7 @@
 plugins {
-    id "org.jetbrains.intellij" version "0.4.9"
+    id "org.jetbrains.intellij" version "0.4.18"
     id "com.github.hierynomus.license" version "0.14.0"
-    id "de.undercouch.download" version "3.4.3"
+    id "de.undercouch.download" version "4.0.4"
 }
 
 
@@ -22,7 +22,7 @@ repositories {
     mavenLocal()
     mavenCentral()
     maven {
-        url 'http://dl.bintray.com/jetbrains/intellij-plugin-service'
+        url 'https://dl.bintray.com/jetbrains/intellij-plugin-service'
     }
 }
 

config/checkstyle/checkstyle.xml

@@ -15,6 +15,8 @@
         <property name="basedir" value="${basedir}"/>
     -->
 
+<!--    <property name="cacheFile" value="${checkstyle.cache.file}"/>-->
+
     <!-- Checks that each Java package has a Javadoc file used for commenting. -->
     <!-- See http://checkstyle.sf.net/config_javadoc.html#JavadocPackage       -->
     <!--
@@ -29,6 +31,13 @@
 
     <module name="FileLength"/>
 
+    <module name="LineLength">
+        <property name="max" value="120"/>
+        <property name="fileExtensions" value="java" />
+    </module>
+
+    <module name="SuppressWithPlainTextCommentFilter"/>
+
     <!-- Following interprets the header file as regular expressions. -->
     <!-- <module name="RegexpHeader"/>                                -->
 
@@ -60,8 +69,6 @@
 
     <module name="TreeWalker">
 
-        <!--<property name="cacheFile" value="${checkstyle.cache.file}"/>-->
-
         <module name="SuppressWarningsHolder"/>
 
         <!-- Checks for Javadoc comments.                     -->
@@ -115,9 +122,6 @@
 
         <!-- Checks for Size Violations.                    -->
         <!-- See http://checkstyle.sf.net/config_sizes.html -->
-        <module name="LineLength">
-            <property name="max" value="120"/>
-        </module>
         <module name="MethodLength"/>
         <module name="ParameterNumber">
             <property name="max" value="10"/>

gradle/wrapper/gradle-wrapper.properties

@@ -1,5 +1,5 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-5.4.1-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-6.3-all.zip
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists

src/main/java/org/mapstruct/intellij/util/MapstructUtil.java

@@ -478,7 +478,6 @@ public static boolean isMapStructBuilderSupportPresent(@NotNull PsiFile psiFile)
         } );
     }
 
-
     /**
      * Checks if MapStruct jdk8 is within the provided module. The MapStruct JDK 8 module is present when the
      * {@link Mapping} annotation is annotated with {@link java.lang.annotation.Repeatable}