Expect tst_QTreeView::editTriggers() failure on Mac OS X

EditKeyPressed 4 test data fails, all other test data for the function
pass.

Task-number: QTBUG-23696
Change-Id: Ied56bd0b653ad4dcc2b6451b486aae7cad134211
Reviewed-by: Jason McDonald <jason.mcdonald@nokia.com>

tests/auto/widgets/itemviews/qtreeview/tst_qtreeview.cpp

@@ -841,6 +841,9 @@ void tst_QTreeView::editTriggers()
     }
 
     // Check if we got an editor
+#ifdef Q_OS_MAC
+    QEXPECT_FAIL("EditKeyPressed 4", "QTBUG-23696", Continue);
+#endif
     QTRY_COMPARE(qFindChild<QLineEdit *>(&view, QString()) != 0, editorOpened);
 }