Added PyQualifiedReference.isQualified() that potentially doesn't require AST access

python/psi-api/src/com/jetbrains/python/psi/NameDefiner.java

@@ -58,7 +58,7 @@ public interface NameDefiner extends PsiElement {
       for (PyElement elt : it) {
         if (elt != null) {
           // qualified refs don't match by last name, and we're not checking FQNs here
-          if (elt instanceof PyQualifiedExpression && ((PyQualifiedExpression)elt).getQualifier() != null) continue;
+          if (elt instanceof PyQualifiedExpression && ((PyQualifiedExpression)elt).isQualified()) continue;
           if (name.equals(elt.getName())) { // plain name matches
             ret = elt;
             break;

python/psi-api/src/com/jetbrains/python/psi/PyQualifiedExpression.java

@@ -30,6 +30,13 @@ public interface PyQualifiedExpression extends PyExpression {
   @Nullable
   PyExpression getQualifier();
 
+  /**
+   * Checks if the expression is qualified.
+   *
+   * Unlike {@link #getQualifier()}, it may not require AST access.
+   */
+  boolean isQualified();
+
   /**
    * Returns the name to the right of the qualifier.
    *

python/psi-api/src/com/jetbrains/python/psi/PyTargetExpression.java

@@ -57,6 +57,4 @@ public interface PyTargetExpression extends PyQualifiedExpression, PsiNamedEleme
   
   @Nullable
   PyClass getContainingClass();
-
-  boolean isQualified();
 }