TailTypes#CASE_ARROW: do not add if arrow is present even with different spacing (IDEA-204074)

java/java-impl/src/com/intellij/codeInsight/TailTypes.java

@@ -21,7 +21,6 @@ import com.intellij.codeInsight.completion.simple.ParenthesesTailType;
 import com.intellij.codeInsight.completion.simple.RParenthTailType;
 import com.intellij.openapi.editor.Document;
 import com.intellij.openapi.editor.Editor;
-import com.intellij.openapi.util.TextRange;
 import com.intellij.psi.PsiSwitchBlock;
 import com.intellij.psi.codeStyle.CommonCodeStyleSettings;
 import com.siyeh.ig.psiutils.SwitchUtils;
@@ -142,11 +141,17 @@ public class TailTypes {
     @Override
     public boolean isApplicable(@NotNull InsertionContext context) {
       Document document = context.getDocument();
-      int offset = context.getTailOffset();
       int length = document.getTextLength();
-      int endOffset = offset + ARROW.length();
-      if (endOffset > length) return true;
-      return !document.getText(new TextRange(offset, endOffset)).equals(ARROW);
+      CharSequence chars = document.getCharsSequence();
+      int offset;
+      for(offset = context.getTailOffset(); offset < length; offset++) {
+        char c = chars.charAt(offset);
+        if (c != '\n' && c != ' ' && c != '\t') {
+          break;
+        }
+      }
+      boolean hasArrow = offset + 2 < length && chars.subSequence(offset, offset + 2).toString().equals("->");
+      return !hasArrow;
     }
 
     @Override

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

@@ -3,7 +3,8 @@ public class ConstConfig {
     
     void test(X x) {
         switch (x) {
-            case BAR, FO<caret> -> {}
+            case BAR, FO<caret>   ->
+              System.out.println();
         }
     }
 }

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

@@ -3,7 +3,8 @@ public class ConstConfig {
     
     void test(X x) {
         switch (x) {
-            case BAR, FOO<caret> -> {}
+            case BAR, FOO<caret>   ->
+              System.out.println();
         }
     }
 }