style: 为 checkstyle 添加了 RegexpSingleline 规则 (#7156)

HMCL/src/main/java/org/jackhuang/hmcl/ui/instances/AddonUpdatesPage.java

@@ -324,7 +324,7 @@ public class AddonUpdatesPage extends BorderPane implements DecoratorPage {
                     LOG.warning("Failed to load addon icons", e);
                 }
             }
-            
+
             if (data.localAddonFile() instanceof ResourcePackFile resourcePackFile) {
                 Image image = resourcePackFile.loadIcon();
 

HMCL/src/main/java/org/jackhuang/hmcl/ui/main/JavaManagementPage.java

@@ -315,7 +315,7 @@ public final class JavaManagementPage extends ListPageBase<JavaRuntime> {
 
                 if (oldItem != item) {
                     content.getTags().clear();
-                    content.addTag(item.getArchitecture().getDisplayName());                    
+                    content.addTag(item.getArchitecture().getDisplayName());
                 }
 
                 SVG newRemoveIcon = item.isManaged() ? SVG.DELETE_FOREVER : SVG.DELETE;

HMCLCore/src/main/java/org/jackhuang/hmcl/download/game/GameAssetDownloadTask.java

@@ -25,7 +25,7 @@ import static org.jackhuang.hmcl.util.logging.Logger.LOG;
  * @author huangyuhui
  */
 public final class GameAssetDownloadTask extends Task<Void> {
-    
+
     private final AbstractDependencyManager dependencyManager;
     private final GameInstanceManifest manifest;
     private final AssetIndexInfo assetIndexInfo;

HMCLCore/src/main/java/org/jackhuang/hmcl/util/function/ExceptionalSupplier.java

@@ -10,7 +10,7 @@ import java.util.concurrent.Callable;
  */
 public interface ExceptionalSupplier<R, E extends Exception> {
     R get() throws E;
-    
+
     default Callable<R> toCallable() {
         return this::get;
     }

config/checkstyle/checkstyle.xml

@@ -14,6 +14,13 @@
         <property name="max" value="2000"/>
     </module>
 
+    <module name="RegexpSingleline">
+        <property name="format" value="\s+$"/>
+        <property name="minimum" value="0"/>
+        <property name="maximum" value="0"/>
+        <property name="message" value="Line has trailing whitespace."/>
+    </module>
+
     <module name="TreeWalker">
         <module name="SuppressionCommentFilter"/> <!-- use //CHECKSTYLE:OFF (...) //CHECKSTYLE:ON to disable checkstyle: http://checkstyle.sourceforge.net/config_filters.html#SuppressionCommentFilter -->
         <module name="SuppressionXpathSingleFilter">