Hi,

One may want to customize its `display-buffer-alist' carefully to 
apply the 'no-other-window parameter to eg side windows so they 
are not selected by the `other-window' command and to create 
custom functions of the family (eg creating a 
`find-file-in-other-window' that does not select windows with the 
no-other-window parameter)

Unfortunately by doing so, we actually limit the use of the 
windmove commands since `windmove-find-other-window' always ignore 
windows with this parameter.
It is not a fatality since `window-in-direction' can receive an 
argument to choose if we want to ignore this parameter or not.

This draft implements an user option to let the user choose that 
behavior.

Because it applies to `windmove-find-other-window', it allows the 
commands windmove-right, windmove-left, windmove-down, windmove-up 
to select windows with the no-other-window parameter, but not for 
the `windmove-display-*' functions. I suppose it is the desired 
behavior.