$ emerge -avpt --newuse --with-bdeps=y --update --deep --keep-going --changed-use --verbose-conflicts --backtrack=100 @world;

$ emerge -avpt --newuse --with-bdeps=y --update --deep --keep-going --changed-use --verbose-conflicts --backtrack=100 @world;

$ emerge -avpt --newuse --with-bdeps=y --update --deep --keep-going --changed-use --verbose-conflicts --backtrack=100 @world

These are the packages that would be merged, in reverse order:

Calculating dependencies  . ...... done!

Total: 0 packages, Size of downloads: 0 KiB

WARNING: One or more updates/rebuilds have been skipped due to a dependency conflict:

x11-base/xorg-server:0

  (x11-base/xorg-server-21.1.2-r3:0/21.1.2::gentoo, ebuild scheduled for merge) USE="systemd udev xorg -debug (-elogind) -minimal (-selinux) -suid -test -unwind -xcsecurity -xephyr -xnest -xvfb" ABI_X86="(64)" conflicts with
    =x11-base/xorg-server-1.20* required by (net-misc/tigervnc-1.9.0-r2:0/0::gentoo, installed) USE="drm nls opengl pam server xorgmodule -dri3 -gnutls -java -xinerama" ABI_X86="(64)"
    ^                     ^^^^^
    x11-base/xorg-server:0/1.20.14= required by (x11-drivers/xf86-video-ati-19.1.0-r1:0/0::gentoo, installed) USE="udev" ABI_X86="(64)"
                        ^^^^^^^^^^^
    x11-base/xorg-server:0/1.20.14= required by (x11-drivers/xf86-video-amdgpu-21.0.0:0/0::gentoo, installed) USE="udev" ABI_X86="(64)"
                        ^^^^^^^^^^^
    x11-base/xorg-server:0/1.20.14= required by (x11-drivers/xf86-input-libinput-1.2.0:0/0::gentoo, installed) USE="" ABI_X86="(64)"
                        ^^^^^^^^^^^

dev-python/docutils:0

  (dev-python/docutils-0.18.1:0/0::gentoo, ebuild scheduled for merge) USE="" ABI_X86="(64)" PYTHON_TARGETS="python3_9 -pypy3 -python3_10 -python3_8" conflicts with
    <dev-python/docutils-0.18[python_targets_python3_9(-)] required by (dev-python/sphinx_rtd_theme-1.0.0:0/0::gentoo, installed) USE="-test" ABI_X86="(64)" PYTHON_TARGETS="python3_9 -pypy3 -python3_10 -python3_8"
    ^                    ^^^^                             
    <dev-python/docutils-0.18[python_targets_python3_9(-)] required by (dev-python/sphinx-4.3.2:0/0::gentoo, installed) USE="-doc -latex -test" ABI_X86="(64)" PYTHON_TARGETS="python3_9 -pypy3 -python3_10 -python3_8"
    ^                    ^^^^                             


!!! The following update(s) have been skipped due to unsatisfied dependencies
!!! triggered by backtracking:

x11-base/xorg-drivers:0