IDEA-55146 Autocomplete case inside switch

indent, remove duplicates, restore completion after 'case' (IDEA-CR-12610)

java/java-tests/testData/codeInsight/completion/keywords/noCaseInsideWhileInSwitch.java

@@ -0,0 +1,8 @@
+public class StructuredConfigKey {
+  {
+    switch (x) {
+      case 2:
+        while (true) <caret>
+    }
+  }
+}