Refresh action mode always when selection is modified.

Text action mode was not correctly updated when the selection
is modified by keyboard, app or IME.
With this CL, Editor#refreshTextActionMode is called always when
selection is updated. This method properly starts, stops or
invalidates text action mode if selection was modified outside of
cursor controllers.

Bug: 10527362
Bug: 22937774

Change-Id: Ic025c109539c3b59638226be4c4c9adf5ea0c38c