changes in function signature are out-of-code-block changes (PY-821)

python/src/com/jetbrains/python/PythonPsiManager.java

@@ -88,7 +88,8 @@ public class PythonPsiManager extends AbstractProjectComponent implements PsiTre
       }
       PsiElement pparent = element.getParent();
       if (pparent instanceof PyFunction) {
-        return true;
+        final PyFunction pyFunction = (PyFunction)pparent;
+        return !(element == pyFunction.getParameterList() || element == pyFunction.getNameIdentifier());
       }
       element = pparent;
     }

python/src/com/jetbrains/python/psi/PyFunction.java

@@ -1,6 +1,7 @@
 package com.jetbrains.python.psi;
 
 import com.intellij.lang.ASTNode;
+import com.intellij.psi.PsiNameIdentifierOwner;
 import com.intellij.psi.PsiNamedElement;
 import com.intellij.psi.StubBasedPsiElement;
 import com.jetbrains.python.codeInsight.controlflow.ScopeOwner;
@@ -13,7 +14,7 @@ import org.jetbrains.annotations.Nullable;
  *
  * @author yole
  */
-public interface PyFunction extends PsiNamedElement, PyStatement, NameDefiner, PyDocStringOwner, StubBasedPsiElement<PyFunctionStub>,
+public interface PyFunction extends PsiNamedElement, PsiNameIdentifierOwner, PyStatement, NameDefiner, PyDocStringOwner, StubBasedPsiElement<PyFunctionStub>,
                                     ScopeOwner {
   PyFunction[] EMPTY_ARRAY = new PyFunction[0];
   

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

@@ -49,6 +49,11 @@ public class PyFunctionImpl extends PyPresentableElementImpl<PyFunctionStub> imp
     return node != null ? node.getText() : null;
   }
 
+  public PsiElement getNameIdentifier() {
+    final ASTNode nameNode = getNameNode();
+    return nameNode != null ? nameNode.getPsi() : null;
+  }
+
   public PsiElement setName(@NotNull String name) throws IncorrectOperationException {
     final ASTNode nameElement = PyElementGenerator.getInstance(getProject()).createNameIdentifier(name);
     getNode().replaceChild(getNameNode(), nameElement);