sway: position certain apps (mpv, Celeste) on external displays by default

hosts/common/programs/sway/sway-config

@@ -47,6 +47,7 @@ focus_wrapping no
 focus_follows_mouse yes
 workspace_layout $default_workspace_layout
 
+
 ### key bindings
 floating_modifier $mod
 #### media keys
@@ -137,6 +138,7 @@ mode "resize" {
   bindsym l resize grow width 30 px
 }
 
+
 ### application-specific settings
 #### to obtain app-id's run `swaymsg -t get_tree`
 for_window [title="megapixels"] inhibit_idle open
@@ -163,6 +165,19 @@ for_window [app_id="deadd-notification-center"] {
   move left 360
 }
 
+for_window [app_id="mpv"] {
+  move to output "LG Electronics LG TV 0x01010101"
+}
+for_window [app_id="Celeste64"] {
+  # this only works if Celeste doesn't itself request fullscreen (else, random chance of which display it gets).
+  # so enter in-game options and disable "Fullscreen", then we manage it here ourselves
+  move to output "LG Electronics LG TV 0x01010101"
+  fullscreen enable
+  # move to output "HDMI-A-2"
+  # move output right
+}
+
+
 ### displays
 ## DESKTOP
 output "LG Electronics LG ULTRAWIDE 0x00004E94" {
@@ -204,6 +219,7 @@ output "DSI-1" {
   # scale 1.6
 }
 
+
 # manually export PATH here, since all my user services need that, and sane-sandboxed implementation depends on it.
 # also, manually export XDG_DATA_DIRS. glib fails in weird ways (e.g. thinks everything is application/x-octet-stream mime type) without it.
 # for more, see: <repo:nixos/nixpkgs:nixos/modules/programs/wayland/sway.nix>