[PATCH] xdg-shell: add set_max_size request

[Mike Blumenkrantz]

On Mon, Apr 4, 2016 at 1:17 PM Olivier Fourdan <ofourdan at redhat.com> wrote:

> Hi Mike,
>
> > Hm, you raise some interesting points. However, I think your argument is
> > somewhat misled by your claim that "this case is unique". If there is an
> > application which does not want to be larger than a certain size, why
> could
> > there not also be an application which does not want to be smaller than a
> > certain size?
>
> It's unique because switching to maximize/fullscreen is not an interactive
> resize, ie the client doesn't have its word on the state change that
> implies the resize, and is mandatory configure event, until it's set by the
> compositor (ie too late, the client must obey, period).
>

Maximize can mean different things in different cases. For example, suppose
a compositor has a maximize policy where it can "maximize" a window to take
up the top-left 25% of the screen. This size could be too small for the
application, yet it falls within your non-interactive resize case.


>
> > It seems like continuing to add size hints based on this logic is almost
> > guaranteed, especially if you then add in the point of tiling
> > policies--surely handling tiling would be made even easier by adding
> > min/step/aspect sizes!
> >
> > To me, xdg-shell should just be a bare minimum of things required to
> > implement a UI with Wayland. Perhaps if there's a real need for size
> hints
> > (which I really hope there isn't, since it made X11 window sizing very
> > annoying) then there should be a separate size hints protocol where all
> of
> > this can be implemented?
>
> One case where a compositor may need a min size hint is a tiling
> window/compositing manager, so it can base its heuristics on those hints
> from the clients to get the optimal window size for tiling, but I would let
> those who implement such a window/compositor manager advocate for that,
> it's not the specific case I'm interested in here :-)
>
> Cheers,
> Olivier
>

Yes, I know you are not currently advocating for it, but you've proved my
point--others will see this go in and then they will push for it. Adding
any form of size hints is a slipper slope which leads to more size hints
imo.
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