string -> raw: process leading/tailing tics (IDEA-189855)

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/advRawStringLiteral/StringToRawTransformationLeadingTics.after.java

@@ -0,0 +1,5 @@
+class A {
+  {
+    String s = "````" + `a` + "`";
+  }
+}

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/advRawStringLiteral/StringToRawTransformationLeadingTics.java

@@ -0,0 +1,5 @@
+class A {
+  {
+    String s = "````<caret>a`";
+  }
+}

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/advRawStringLiteral/StringToRawTransformationOnlyTics.java

@@ -0,0 +1,5 @@
+class A {
+  {
+    String s = "````<caret>`";
+  }
+}