fish: conf.d: Drop setting of some environment variables

These have now been moved to environment.d and get set by systemd.

https://wiki.archlinux.org/title/Systemd/User#Environment_variables

fish/.config/fish/conf.d/setup.fish

@@ -1,40 +1,10 @@
 function __fish_setup_on_tty_login --description "Set up environment on tty login"
-    set -qx XDG_CONFIG_HOME; or set -Ux XDG_CONFIG_HOME $HOME/.config
-    set -qx XDG_CACHE_HOME; or set -Ux XDG_CACHE_HOME $HOME/.cache
-    set -qx XDG_DATA_HOME; or set -Ux XDG_DATA_HOME $HOME/.local/share
-    set -qx XDG_STATE_HOME; or set -Ux XDG_STATE_HOME $HOME/.local/state
-    set -qx SSH_AUTH_SOCK; or set -Ux SSH_AUTH_SOCK $XDG_RUNTIME_DIR/ssh-agent.socket
-
-    # Wayland session
-    set -qx XDG_SESSION_TYPE; or set -Ux XDG_SESSION_TYPE wayland
-    set -qx XDG_SESSION_DESKTOP; or set -Ux XDG_SESSION_DESKTOP wayland
-    set -qx XDG_CURRENT_DESKTOP; or set -Ux XDG_CURRENT_DESKTOP wayland
-
-    # Firefox
-    set -qx MOZ_ENABLE_WAYLAND; or set -Ux MOZ_ENABLE_WAYLAND 1
-    set -qx MOZ_DBUS_REMOTE; or set -Ux MOZ_DBUS_REMOTE 1
-
-    # QT
-    set -qx QT_QPA_PLATFORM; or set -Ux QT_QPA_PLATFORM wayland
-    set -qx QT_QPA_PLATFORMTHEME; or set -Ux QT_QPA_PLATFORMTHEME qt5ct
-
     for extra_path in ~/.{local,nix-profile,cargo,cabal,ghcup}/bin
         if test -d "$extra_path"
             set -gxp PATH "$extra_path"
         end
     end
 
-    if type -qf nvim
-        set -gx EDITOR nvim
-        set -gx VISUAL nvim
-        set -gx MANPAGER 'nvim +Man!'
-    else
-        if type -qf vim
-            set -gx EDITOR vim
-            set -gx VISUAL vim
-        end
-    end
-
     if test -d {$HOME}/.nix-defexpr/channels
         set -gx NIX_PATH {$HOME}/.nix-defexpr/channels
         set -gx NIX_SSL_CERT_FILE '/etc/ssl/certs/ca-certificates.crt'
@@ -57,16 +27,16 @@ function __fish_setup_on_tty_login --description "Set up environment on tty logi
         fnm env --shell=fish --log-level=quiet | source
     end
 
-    set -gx CLICOLOR 1
-    set -gx LSCOLORS gxfxcxdxbxegedabaggxgx
-
-    set -Ux GST_DEBUG_NO_COLOR 1
-    set -Ux GST_DEBUG_COLOR_MODE off
-
+    # Temporary directory for GStreamer dot files
     mkdir -p /tmp/gst-dot
-    set -Ux GST_DEBUG_DUMP_DOT_DIR /tmp/gst-dot
 
-    set -Ux GHCUP_USE_XDG_DIRS 1
+    # Needed for silencing some warnings from Sway. Will not work with systemd
+    # environment.d.
+    set -gx WLR_NO_HARDWARE_CURSORS 1
+
+    # Required for all environment variables to be set correctly, especially
+    # in tmux session service.
+    dbus-update-activation-environment --systemd --all
 end
 
 # Instead of tty check, we would have liked to do this using status is-login