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

Calculating dependencies ... done!
Dependency resolution took 1.59 s (backtrack: 0/20).

[ebuild  NS    ] app-text/docbook-xml-dtd-4.3-r2:4.3::gentoo [4.1.2-r7:4.1.2::gentoo, 4.2-r3:4.2::gentoo, 4.4-r3:4.4::gentoo, 4.5-r2:4.5::gentoo] 82 KiB
[ebuild  N     ] sys-apps/bubblewrap-0.13.0::gentoo  USE="-debug (-selinux) -test" 127 KiB
[ebuild  N     ] media-libs/glycin-loaders-2.2.3:2::gentoo  USE="-debug -heif -jpegxl -svg -test" 21670 KiB
[ebuild  N     ] media-libs/glycin-2.1.1-r1:2::gentoo  USE="-debug -doc -gtk -introspection -test -vala" 24797 KiB

Total: 4 packages (3 new, 1 in new slot), Size of downloads: 46675 KiB