introduce injected fragment as string (IDEA-90322)

java/java-tests/testData/refactoring/introduceVariable/FromInjected.after.java

@@ -0,0 +1,6 @@
+class Test {
+  {
+      String regexp = "|\t";
+      String[] parts = "".split(regexp);
+  }
+}

java/java-tests/testData/refactoring/introduceVariable/FromInjected.java

@@ -0,0 +1,5 @@
+class Test {
+  {
+    String[] parts = "".split("|<caret>\t");
+  }
+}

java/java-tests/testSrc/com/intellij/refactoring/IntroduceVariableTest.java

@@ -109,6 +109,10 @@ public class IntroduceVariableTest extends LightCodeInsightTestCase {
     doTest(new MockIntroduceVariableHandler("it", false, false, false, "java.lang.String"));
   }
 
+  public void testFromInjected() throws Exception {
+    doTest(new MockIntroduceVariableHandler("regexp", false, false, false, "java.lang.String"));
+  }
+
   public void testSCR10412() throws Exception {
     doTest(new MockIntroduceVariableHandler("newVar", false, false, false, "java.lang.String[]"));
   }