Hola
| Is it current latest tagged/released version 25.0.0.8 a compatible Xorg server able to run all the same packages as Arch Linux xorg-server package? Yes, the current Xlibre xserver 25.0.0.8 can run all the same packages and the Arch xorg-server packages. Exceptions here are also regarded as bugs.
So at the moment, you say, there are not such exceptions if xlibre-server provides xorg-server, both binaries and libraries are still compatible with a random client requiring ANY function from /usr/lib/xorg/modules/extensions/libglx.so ?
| What will happen if a user keeps xf86-* or xorg-* packages from the official repositories along with xlibre-server? All xlibre-xserver AUR packages conflict with, and provide, the corresponding xorg-xserver packages. The same is true for the xf86 packages, for which the mentioned documentation also contains: "Build and install all xlibre packages of which the corresponding xorg one has been removed"
A package with provides is meant to offer a compatible experience with the "provided" package, which seems not exactly the xlibre case. Installing for example xf86-video-intel would break or will xf86-video-intel package work properly with xlibre-server?
A similar message is shown by pacman while installing the package, using an install file: "It is required to replace all installed xf86* xorg driver packages with their xlibre-xf86* counterparts before starting xlibe-xsever. So if for example xf86-video-intel has been installed it should be replaced with xlibre-xf86-video-intel."
This seems exactly the opposite of the above example of mine. Please clarify the above doubts. Best regards -- Muflone