hyprland: match scratchpads by dedicated ghostty class, not title

settings/hyprland.nix

@@ -263,17 +263,25 @@ in
             hl.layer_rule({ match = { namespace = "quickshell-bar" }, blur = true, ignore_alpha = 0.3 })
             hl.layer_rule({ match = { namespace = "quickshell-osd" }, blur = true, ignore_alpha = 0.3 })
 
-            -- Scratchpad respawn: both special-workspace terminals are meant to
+            -- Both special-workspace terminals get their own --class, which does
-            -- exist for the whole session, so SUPER+Q on them reads as "reset
+            -- two things ghostty's --title cannot. First, gtk-single-instance
-            -- this thing", not "close it". Relaunch on close.
+            -- means a second `ghostty` hands its request to the running instance
+            -- and exits; forwarded requests keep -e but DROP --title, so the
+            -- window ends up named by the shell and no title rule matches it.
+            -- A distinct class forces a separate instance. Second, the class is
+            -- fixed at surface creation, so the shell's own title escapes can't
+            -- desync the window rules or the respawn below.
+            --
+            -- Respawn: these are meant to exist for the whole session, so SUPER+Q
+            -- on them reads as "reset this thing", not "close it".
             local scratchpads = {
-              ["scratchpad"] = "ghostty --title=scratchpad",
+              ["dev.fred.scratchpad"] = "ghostty --class=dev.fred.scratchpad --title=scratchpad",
-              ["spotify-player"] = "ghostty --title=spotify-player -e spotify_player",
+              ["dev.fred.spotify"] = "ghostty --class=dev.fred.spotify --title=spotify-player -e spotify_player",
             }
             local shutting_down = false
             hl.on("hyprland.shutdown", function() shutting_down = true end)
             hl.on("window.close", function(win)
-              local cmd = scratchpads[win.title]
+              local cmd = scratchpads[win.class]
               if cmd and not shutting_down then hl.exec_cmd(cmd) end
             end)
 
@@ -295,11 +303,11 @@ in
               -- Warms spotify-player's Spotify Connect device while you're
               -- doing something else; the window rule above swallows it onto
               -- special:music silently, so it never steals focus.
-              hl.exec_cmd("ghostty --title=spotify-player -e spotify_player")
+              hl.exec_cmd(scratchpads["dev.fred.spotify"])
               -- Scratchpad terminal, same trick: parked on special:scratch at
               -- login so SUPER+Return is always an instant toggle and the shell
               -- keeps its history/cwd between peeks.
-              hl.exec_cmd("ghostty --title=scratchpad")
+              hl.exec_cmd(scratchpads["dev.fred.scratchpad"])
               -- swayosd removed; volume/brightness OSD handled by quickshell
               ${lib.optionalString isMacbook ''hl.exec_cmd("hypridle")''}
             end)
@@ -343,38 +351,38 @@ in
             -- Spotify's backend, and that cost is per *process*, so relaunching
             -- a terminal for it means waiting every time. Parking one instance
             -- here pays it once at login; SUPER+M slides it in and out.
-            -- Matched on title, not class: gtk-single-instance means every
+            -- Matched on the dedicated --class set above, not on title: a shell
-            -- ghostty window is the same app-id, and --title is authoritative
+            -- prompt rewrites its window title, and forwarded single-instance
-            -- (ghostty ignores the program's own title escapes once it is set).
+            -- launches never carry --title in the first place.
             hl.window_rule({
-              match = { title = "^spotify-player$" },
+              match = { class = "^dev.fred.spotify$" },
               workspace = "special:music silent",
             })
 
             -- Inset it rather than filling the screen, so the workspace
             -- underneath still frames it. Floating is what makes a percentage
             -- size stick: a tiled window is sized by the layout, which would
-            -- just expand it back to the full area. Matched on title for the
+            -- just expand it back to the full area. Matched on class for the
             -- same reason as above, and because matching on the special
             -- workspace would depend on the assignment rule running first.
             hl.window_rule({
               name  = "spotify-player-inset",
-              match = { title = "^spotify-player$" },
+              match = { class = "^dev.fred.spotify$" },
               float = true,
               size = "80% 80%",
               center = true,
             })
 
-            -- Scratchpad terminal — same title-match + float-to-inset pattern as
+            -- Scratchpad terminal — same class-match + float-to-inset pattern as
             -- spotify-player above.
             hl.window_rule({
-              match = { title = "^scratchpad$" },
+              match = { class = "^dev.fred.scratchpad$" },
               workspace = "special:scratch silent",
             })
 
             hl.window_rule({
               name  = "scratchpad-inset",
-              match = { title = "^scratchpad$" },
+              match = { class = "^dev.fred.scratchpad$" },
               float = true,
               size = "80% 80%",
               center = true,