show seen members of same qualifier in completion list (PY-1181)

python/src/com/jetbrains/python/psi/impl/PyQualifiedReferenceImpl.java

@@ -171,6 +171,7 @@ public class PyQualifiedReferenceImpl extends PyReferenceImpl {
           final PyClassType classType = new PyClassType(classes.iterator().next(), false);
           return ((PyReferenceExpressionImpl) myElement).getTypeCompletionVariants(classType);
         }
+        return collectSeenMembers(qualifier.getText());
       }
     }
     return ArrayUtil.EMPTY_OBJECT_ARRAY;
@@ -195,6 +196,23 @@ public class PyQualifiedReferenceImpl extends PyReferenceImpl {
     return result;
   }
 
+  private Object[] collectSeenMembers(final String text) {
+    final List<String> results = new ArrayList<String>();
+    myElement.getContainingFile().accept(new PyRecursiveElementVisitor() {
+      @Override
+      public void visitPyReferenceExpression(PyReferenceExpression node) {
+        super.visitPyReferenceExpression(node);
+        if (node != myElement) {
+          final PyExpression qualifier = node.getQualifier();
+          if (qualifier != null && qualifier.getText().equals(text)) {
+            results.add(node.getReferencedName());
+          }
+        }
+      }
+    });
+    return results.toArray(new Object[results.size()]);
+  }
+
   private static Collection<PyExpression> collectAssignedAttributes(PyQualifiedExpression qualifier) {
     List<PyQualifiedExpression> qualifier_path = PyResolveUtil.unwindQualifiers(qualifier);
     if (qualifier_path != null) {

python/testData/completion/seenMembers.after.py

@@ -0,0 +1,5 @@
+def foo(element):
+    print(element.children)
+
+def bar(element):
+    element.children

python/testData/completion/seenMembers.py

@@ -0,0 +1,5 @@
+def foo(element):
+    print(element.children)
+
+def bar(element):
+    element.ch<caret>

python/testSrc/com/jetbrains/python/PythonCompletionTest.java

@@ -115,6 +115,10 @@ public class PythonCompletionTest extends PyLightFixtureTestCase {
     doTest();
   }
 
+  public void testSeenMembers() throws Exception {  // PY-1181
+    doTest();
+  }
+
   public void testImportModule() throws Exception {
     final String testName = "completion/" + getTestName(true);
     myFixture.configureByFiles(testName + ".py", "completion/someModule.py");