RSL: string escaper is redundant (IDEA-191095)

java/java-psi-impl/src/com/intellij/psi/impl/source/tree/java/PsiLiteralExpressionImpl.java

@@ -3,6 +3,7 @@ package com.intellij.psi.impl.source.tree.java;
 
 import com.intellij.codeInsight.CodeInsightUtilCore;
 import com.intellij.lang.ASTNode;
+import com.intellij.openapi.util.TextRange;
 import com.intellij.openapi.util.text.StringUtil;
 import com.intellij.psi.*;
 import com.intellij.psi.impl.PsiManagerEx;
@@ -226,6 +227,25 @@ public class PsiLiteralExpressionImpl
   @Override
   @NotNull
   public LiteralTextEscaper<PsiLiteralExpressionImpl> createLiteralTextEscaper() {
+    if (getLiteralElementType() == JavaTokenType.RAW_STRING_LITERAL) {
+      return new LiteralTextEscaper<PsiLiteralExpressionImpl>(this) {
+        @Override
+        public boolean decode(@NotNull final TextRange rangeInsideHost, @NotNull StringBuilder outChars) {
+          outChars.append(rangeInsideHost.substring(myHost.getText()));
+          return true;
+        }
+
+        @Override
+        public int getOffsetInHost(int offsetInDecoded, @NotNull final TextRange rangeInsideHost) {
+          return offsetInDecoded + rangeInsideHost.getStartOffset();
+        }
+
+        @Override
+        public boolean isOneLine() {
+          return false;
+        }
+      };
+    }
     return new StringLiteralEscaper<>(this);
   }
 }