introduce constant from literal: ignore null anchors for non-physical elements (IDEA-118166)

java/java-tests/testData/refactoring/introduceConstant/PartialStringLiteralAnchorFromAnnotation.java

@@ -0,0 +1,14 @@
+@Model(usages = @Usage("${<selection>__REQUEST_PARAMETERS</selection>}"))
+public class SomeClass {
+
+  public String getModelName() {
+    return "__REQUEST_PARAMETERS";
+  }
+}
+
+@interface Model {
+  Usage usages();
+}
+@interface Usage {
+  String value();
+}

java/java-tests/testData/refactoring/introduceConstant/PartialStringLiteralAnchorFromAnnotation_after.java

@@ -0,0 +1,16 @@
+@Model(usages = @Usage("${" + SomeClass.xxx + "}"))
+public class SomeClass {
+
+    public static final String xxx = "__REQUEST_PARAMETERS";
+
+    public String getModelName() {
+    return xxx;
+  }
+}
+
+@interface Model {
+  Usage usages();
+}
+@interface Usage {
+  String value();
+}