Backport PR #10225: Add 'v' binding in vi-navigation-mode to %edit.

See https://github.com/ipython/ipython/pull/9929 issuecomment-276264230.

IPython/terminal/shortcuts.py

@@ -4,7 +4,7 b' import sys'
 from prompt_toolkit.enums import DEFAULT_BUFFER, SEARCH_BUFFER
 from prompt_toolkit.filters import (HasFocus, HasSelection, Condition,
     ViInsertMode, EmacsInsertMode, HasCompletions)
-from prompt_toolkit.filters.cli import ViMode
+from prompt_toolkit.filters.cli import ViMode, ViNavigationMode
 from prompt_toolkit.keys import Keys
 from prompt_toolkit.key_binding.bindings.completion import display_completions_like_readline
 
@@ -66,6 +66,10 b' def register_ipython_shortcuts(registry, shell):'
                          filter=HasFocus(DEFAULT_BUFFER)
                         )(open_input_in_editor)
 
+    registry.add_binding('v',
+                         filter=HasFocus(DEFAULT_BUFFER) & ViNavigationMode()
+                        )(open_input_in_editor)
+
     if shell.display_completions == 'readlinelike':
         registry.add_binding(Keys.ControlI,
                              filter=(HasFocus(DEFAULT_BUFFER)