A simple hack is to re-open the info window by 'zoom_changed' event.
First test if info window is open by

  if (infowindow.getMap())

Then open it by

  infowindow.open(map);

However it opens without any pixel offset to the marker. To make it
open in exact position on top of the marker, you need the anchor
property. That is available by an undocumented getAnchor() method of
InfoWindow. You could also save the anchor marker to a variable. In
the example, availability of getAnchor() is tested.
http://koti.mbnet.fi/ojalesa/v3/iwzoom.htm

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