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

Calculating dependencies  
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.... done!
Dependency resolution took 4.74 s (backtrack: 6/20).

[ebuild  N     ] x11-themes/hicolor-icon-theme-0.17 
[ebuild  N     ] dev-libs/vala-common-0.56.18 
[ebuild  N     ] x11-libs/libXcomposite-0.4.6  USE="-doc" ABI_X86="(64) -32 (-x32)" 
[ebuild  N     ] x11-libs/libXdamage-1.1.6  ABI_X86="(64) -32 (-x32)" 
[ebuild  N     ] x11-libs/libXi-1.8.2  USE="-doc" ABI_X86="(64) -32 (-x32)" 
[ebuild  N     ] dev-lang/vala-0.56.18  USE="-test -valadoc" 
[ebuild   R    ] x11-libs/cairo-1.18.4-r1  USE="X*" 
[ebuild  N     ] x11-libs/gdk-pixbuf-2.42.12  USE="introspection -gif -gtk-doc -jpeg -test -tiff" ABI_X86="(64) -32 (-x32)" 
[ebuild  N     ] dev-libs/fribidi-1.0.16  USE="-doc -test" ABI_X86="(64) -32 (-x32)" 
[ebuild  N     ] app-accessibility/at-spi2-core-2.54.1-r1  USE="introspection -X -dbus-broker -gtk-doc -systemd -test" ABI_X86="(64) -32 (-x32)" 
[ebuild  N     ] media-gfx/graphite2-1.3.14_p20210810-r3  USE="-perl -test" ABI_X86="(64) -32 (-x32)" 
[ebuild  N     ] media-libs/harfbuzz-11.2.1  USE="cairo glib graphite introspection truetype -debug -doc -experimental -icu -test" ABI_X86="(64) -32 (-x32)" 
[ebuild  N     ] dev-util/gtk-update-icon-cache-3.24.42 
[ebuild  N     ] x11-libs/pango-1.56.3  USE="X introspection -debug -examples -sysprof -test" ABI_X86="(64) -32 (-x32)" 
[ebuild  N     ] gnome-base/librsvg-2.58.5-r1  USE="introspection vala -debug -gtk-doc" ABI_X86="(64) -32 (-x32)" 
[ebuild  N     ] x11-libs/gtk+-3.24.49-r1  USE="X introspection (-aqua) -broadway -cloudproviders -colord -cups -examples -gtk-doc -sysprof -test -vim-syntax -wayland -xinerama" ABI_X86="(64) -32 (-x32)" 
[ebuild  N     ] x11-themes/adwaita-icon-theme-legacy-46.2 
[ebuild  N     ] x11-themes/adwaita-icon-theme-47.0  USE="-branding"