[java-highlighting] IDEA-324445 IJ-CR-110332 offer when after TypePattern

GitOrigin-RevId: e83a11865b073e51f26361121a739d4977abf17b

java/java-impl/src/com/intellij/codeInsight/completion/JavaKeywordCompletion.java

@@ -318,8 +318,7 @@ public class JavaKeywordCompletion {
   }
 
   private void addWhen() {
-    LanguageLevel level = PsiUtil.getLanguageLevel(myPosition);
-    if (!(level == LanguageLevel.JDK_20_PREVIEW || level.isAtLeast(LanguageLevel.JDK_21))) {
+    if (!HighlightingFeature.PATTERN_GUARDS_AND_RECORD_PATTERNS.isAvailable(myPosition)) {
       return;
     }
     PsiElement element = PsiTreeUtil.skipWhitespacesAndCommentsForward(myPrevLeaf);

java/java-tests/testData/codeInsight/completion/normal/WhenInSwitchRule.java

@@ -0,0 +1,7 @@
+class Main {
+  void f(Object o) {
+    switch (o) {
+      case String s whe<caret>
+    }
+  }
+}

java/java-tests/testData/codeInsight/completion/normal/WhenInSwitchRule_after.java

@@ -0,0 +1,7 @@
+class Main {
+  void f(Object o) {
+    switch (o) {
+      case String s when <caret>
+    }
+  }
+}

java/java-tests/testSrc/com/intellij/java/codeInsight/completion/NormalSwitchCompletionTest.java

@@ -10,7 +10,7 @@ public class NormalSwitchCompletionTest extends NormalCompletionTestCase {
   @NotNull
   @Override
   protected LightProjectDescriptor getProjectDescriptor() {
-    return JAVA_20;
+    return JAVA_21;
   }
 
   public void testDefaultInRuleSwitch() { doTest(); }
@@ -81,6 +81,7 @@ public class NormalSwitchCompletionTest extends NormalCompletionTestCase {
   public void testCompleteFinalInsideSwitch() { doTest("\n"); }
 
   public void testCompleteYieldInsideSwitch() { doTest(); }
+  public void testWhenInSwitchRule() { doTest(); }
 
   private void doTestPostfixCompletion() {
     LiveTemplateCompletionContributor.setShowTemplatesInTests(true, myFixture.getTestRootDisposable());