optimization: reduce garbage

GitOrigin-RevId: 9e59c29645628469a14275850321903c823e376c

platform/core-api/src/com/intellij/lang/CompositeLanguage.java

@@ -42,7 +42,7 @@ public class CompositeLanguage extends Language {
     for (LanguageFilter filter : myFilters) {
       if (filter.isRelevantForFile(psi)) extensions.add(filter.getLanguage());
     }
-    return extensions.toArray(new Language[0]);
+    return extensions.toArray(Language.EMPTY_ARRAY);
   }
 
   public LanguageFilter @NotNull [] getLanguageExtensions() {

platform/core-api/src/com/intellij/lang/Language.java

@@ -36,6 +36,7 @@ import java.util.concurrent.ConcurrentMap;
  * The language coming from file type can be changed by {@link com.intellij.psi.LanguageSubstitutor}.
  */
 public abstract class Language extends UserDataHolderBase {
+  public static final Language[] EMPTY_ARRAY = new Language[0];
   private static final Map<Class<? extends Language>, Language> ourRegisteredLanguages = new ConcurrentHashMap<>();
   private static final ConcurrentMap<String, List<Language>> ourRegisteredMimeTypes = new ConcurrentHashMap<>();
   private static final Map<String, Language> ourRegisteredIDs = new ConcurrentHashMap<>();

platform/lang-impl/src/com/intellij/openapi/fileEditor/impl/text/TextEditorPsiDataProvider.java

@@ -154,7 +154,7 @@ public class TextEditorPsiDataProvider implements EditorDataProvider {
       if (psiFile != null) {
         addIfNotNull(set, psiFile.getViewProvider().getBaseLanguage());
       }
-      return set.toArray(new Language[0]);
+      return set.toArray(Language.EMPTY_ARRAY);
     }
     return null;
   }