Handling resolution change and rearrangement of displays

[Alexander Zvegintsev]

Hello,

I have some questions regarding handling resolution change and 
rearrangement of displays while screen cast session is active.

I can receive current display properties and arrangement in space(x,y, 
width and height of each display) via response from Start 
<https://flatpak.github.io/xdg-desktop-portal/#gdbus-method-org-freedesktop-portal-ScreenCast.Start> 
method during initialization.


1. But if I change a screen's resolution while streaming is active, I am 
expecting to `on_param_changed 
<https://gitlab.freedesktop.org/pipewire/pipewire/-/blob/master/doc/tutorial5.c#L43>` 
being called with updated display size(width and height of stream, it 
won't have location of display though), but it does not happen.

Is my expectation is wrong and I just need to create a new session in 
this case?

2. Another case is the position change of the two screens relative to 
each other(x,y).

One possible way to get changed display arrangement is before mentioned 
parsing of the response of `Start` method.

Is there are any other options available?


-- 
--
Thanks,
Alexander.
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