Also the documentation you point to states:
Once a client's window has left the Withdrawn state, the window will be
mapped if it is in the Normal state and the window will be unmapped if
it is in the Iconic state.
I requested further clarification:
https://gitlab.gnome.org/GNOME/mutter/issues/589
Having the same issue in 14LTS and 16LTS
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https://bugs.launchpad.net/bugs/1502370
Title:
Unity does not send UnmapNotify event when window is iconified
To manage