These are files that are not needed in this branch, and that were added by
mistake, however not being referenced by meson none of them has been ever
built nor made any difference.

Don't manually compute the unscaled display size taking care of its rotation
as this is now already happening at construction time.
And take care of the configured scaling to compute its scaling value.

This was causing a regressions, making vertical monitors not to be properly
configured (under nvidia) and fractional setups not to be properly defined
as they were using an invalid screen size.

Also update the CRTCs layout configuration when using UI-down scaling as in
such case we need to scale the saved values.
And ensure that we multiply the computed CRTC scale by the UI size if the
resource scale atom is not set.

LP: #1874567
LP: #1873403

Use the currently configured layout in mutter and requested configuration
instead of the settings value to get what's the fractional scaling state

LP: #1876894
LP: #1886996

Fractional scaling layout is ignored when using configurations with a GPU
that has not hotplug mode update.

In such case we need to adapt the configuration to the layout we want to use
otherwise we won't apply the proper configuration.

We should also try to adapt applied configuration to requested layout, when
picking a saved one.

Even previous commit was for the same bugggg!

LP: #1884754

When the UI requests us to go back to a fractional scaling layout coming
from a physical one (or vice-versa) we need to toggle the experimental
setting in order to notify the whole mutter what layout we're using.

LP: #1886996

In case the configuration changes from scaling 1 to 2 or other integer
scaling, we don't have to apply any X11 configuration change, and then we
won't be notified by X11 when changes have been applied, and thus we won't
rebuild the manager logical configuration, notifying our clients about.

So, in such case let's use the same checks but in case we had a weak change,
we also update the UI scaling

LP: #1876894