adapt DisplayHook.quiet() for multiline input

IPython/core/displayhook.py

@@ -96,7 +96,7 b' class DisplayHook(Configurable):'
         tokens = list(tokenize.generate_tokens(sio.readline))
 
         for token in reversed(tokens):
-            if token[0] in (tokenize.ENDMARKER, tokenize.COMMENT):
+            if token[0] in (tokenize.ENDMARKER, tokenize.NL, tokenize.NEWLINE, tokenize.COMMENT):
                 continue
             if (token[0] == tokenize.OP) and (token[1] == ';'):
                 return True

IPython/core/tests/test_displayhook.py

@@ -11,6 +11,10 b' def test_output_displayed():'
     with AssertPrints('2'):
         ip.run_cell('1+1 # comment with a semicolon;', store_history=True)
       
+    with AssertPrints('2'):
+        ip.run_cell('1+1\n#commented_out_function();', store_history=True)
+
+      
 def test_output_quiet():
     """Checking to make sure that output is quiet"""
   
@@ -19,3 +23,6 b' def test_output_quiet():'
       
     with AssertNotPrints('2'):
         ip.run_cell('1+1; # comment with a semicolon', store_history=True)
+
+    with AssertNotPrints('2'):
+        ip.run_cell('1+1;\n#commented_out_function()', store_history=True)