enter in subscription expression (PY-1992)

python/src/com/jetbrains/python/editor/PythonEnterHandler.java

@@ -31,7 +31,8 @@ public class PythonEnterHandler implements EnterHandlerDelegate {
     PyArgumentList.class,
     PyParameterList.class,
     PyFunction.class,
-    PySliceExpression.class
+    PySliceExpression.class,
+    PySubscriptionExpression.class
   };
 
   @Override

python/src/com/jetbrains/python/formatter/PyBlock.java

@@ -46,7 +46,8 @@ public class PyBlock implements ASTBlock {
                                                                       PyElementTypes.PARAMETER_LIST,
                                                                       PyElementTypes.TUPLE_EXPRESSION,
                                                                       PyElementTypes.PARENTHESIZED_EXPRESSION,
-                                                                      PyElementTypes.SLICE_EXPRESSION);
+                                                                      PyElementTypes.SLICE_EXPRESSION,
+                                                                      PyElementTypes.SUBSCRIPTION_EXPRESSION);
 
   private static final TokenSet ourBrackets = TokenSet.create(PyTokenTypes.LPAR, PyTokenTypes.RPAR,
                                                               PyTokenTypes.LBRACE, PyTokenTypes.RBRACE,

python/testSrc/com/jetbrains/python/PyEditingTest.java

@@ -146,6 +146,10 @@ public class PyEditingTest extends PyLightFixtureTestCase {
     doTestEnter("a = some_list[<caret>slice_start:slice_end]", "a = some_list[\n    slice_start:slice_end]");
   }
 
+  public void testEnterInSubscriptionExpression() {  // PY-1992
+    doTestEnter("a = some_list[<caret>slice_start]", "a = some_list[\n    slice_start]");
+  }
+
   private void doTestEnter(String before, final String after) {
     int pos = before.indexOf("<caret>");
     before = before.replace("<caret>", "");