feat: hide decorations on tiled windows

compositor/src/handlers/xdg_shell.rs

@@ -273,21 +273,32 @@ fn check_grab(
 
 impl XdgDecorationHandler for Ferese {
     fn new_decoration(&mut self, toplevel: ToplevelSurface) {
-        set_decoration_mode(&toplevel, Mode::ClientSide);
+        let mode = self.decoration_mode_for(&toplevel);
+        set_decoration_mode(&toplevel, mode);
     }
 
-    fn request_mode(&mut self, toplevel: ToplevelSurface, mode: Mode) {
-        // Phase 1 negotiates decorations but does not yet draw a server frame.
-        // Honor CSD and safely fall back to CSD for premature SSD requests.
-        let mode = match mode {
-            Mode::ClientSide | Mode::ServerSide => Mode::ClientSide,
-            _ => Mode::ClientSide,
-        };
+    fn request_mode(&mut self, toplevel: ToplevelSurface, _mode: Mode) {
+        let mode = self.decoration_mode_for(&toplevel);
         set_decoration_mode(&toplevel, mode);
     }
 
     fn unset_mode(&mut self, toplevel: ToplevelSurface) {
-        set_decoration_mode(&toplevel, Mode::ClientSide);
+        let mode = self.decoration_mode_for(&toplevel);
+        set_decoration_mode(&toplevel, mode);
+    }
+}
+
+impl Ferese {
+    fn decoration_mode_for(&self, toplevel: &ToplevelSurface) -> Mode {
+        self.space
+            .elements()
+            .find(|window| {
+                window
+                    .toplevel()
+                    .is_some_and(|candidate| candidate.wl_surface() == toplevel.wl_surface())
+            })
+            .filter(|window| self.is_floating_window(window))
+            .map_or(Mode::ServerSide, |_| Mode::ClientSide)
     }
 }
 

compositor/src/input.rs

@@ -120,6 +120,15 @@ impl Ferese {
                                     }
                                 }
 
+                                FilterResult::Intercept(())
+                            } else if !modifiers.shift
+                                && matches!(symbol, keysyms::KEY_q | keysyms::KEY_Q)
+                            {
+                                if state == KeyState::Pressed {
+                                    data.intercepted_keys.insert(keycode);
+                                    data.close_focused_window();
+                                }
+
                                 FilterResult::Intercept(())
                             } else if !modifiers.shift
                                 && matches!(symbol, keysyms::KEY_f | keysyms::KEY_F)

compositor/src/state.rs

@@ -23,7 +23,10 @@ use smithay::{
     output::Output,
     reexports::{
         calloop::{EventLoop, Interest, LoopSignal, Mode, PostAction, generic::Generic},
-        wayland_protocols::xdg::shell::server::xdg_toplevel,
+        wayland_protocols::xdg::{
+            decoration::zv1::server::zxdg_toplevel_decoration_v1::Mode as DecorationMode,
+            shell::server::xdg_toplevel,
+        },
         wayland_server::{
             Display, DisplayHandle,
             backend::{ClientData, ClientId, DisconnectReason},
@@ -511,13 +514,19 @@ impl Ferese {
                     }
                 };
 
-                Some((window.clone(), *id, rect, fullscreen == Some(*id)))
+                let is_fullscreen = fullscreen == Some(*id);
+                let is_floating = matches!(
+                    self.workspaces.placement(*id),
+                    Some(WindowPlacement::Floating { .. })
+                );
+
+                Some((window.clone(), *id, rect, is_fullscreen, is_floating))
             })
             .collect::<Vec<_>>();
 
         let now = self.start_time.elapsed();
 
-        for (window, id, rect, is_fullscreen) in placements {
+        for (window, id, rect, is_fullscreen, is_floating) in placements {
             let committed_size = client_size(&window);
             let geometry = self
                 .window_geometry
@@ -534,11 +543,21 @@ impl Ferese {
                         state.size = Some((size.width, size.height).into());
                     }
 
-                    if is_fullscreen {
+                    let fullscreen_changed = if is_fullscreen {
                         state.states.set(xdg_toplevel::State::Fullscreen)
                     } else {
                         state.states.unset(xdg_toplevel::State::Fullscreen)
-                    }
+                    };
+
+                    let decoration_mode = if is_floating && !is_fullscreen {
+                        DecorationMode::ClientSide
+                    } else {
+                        DecorationMode::ServerSide
+                    };
+                    let decoration_changed = state.decoration_mode != Some(decoration_mode);
+                    state.decoration_mode = Some(decoration_mode);
+
+                    fullscreen_changed || decoration_changed
                 });
 
                 if requested_size.is_some() || state_changed {
@@ -763,6 +782,21 @@ impl Ferese {
         self.relayout();
     }
 
+    pub fn close_focused_window(&self) {
+        let Some(focused) = self.focused_window else {
+            return;
+        };
+        let Some(toplevel) = self
+            .window_ids
+            .iter()
+            .find_map(|(window, id)| (*id == focused).then(|| window.toplevel()).flatten())
+        else {
+            return;
+        };
+
+        toplevel.send_close();
+    }
+
     pub fn set_window_fullscreen(&mut self, window: WindowId, enabled: bool) {
         match self.workspaces.set_fullscreen(window, enabled) {
             Ok(true) => self.relayout(),

docs/ferese-window-manager-spec.md

@@ -630,6 +630,11 @@ decorations, Ferese MUST provide usable move, resize, and close interactions.
 Shadows, masks, and focus borders are compositor effects and may apply in either
 mode.
 
+Tiled and fullscreen windows default to borderless server-side decoration so
+application title bars do not consume layout space. Floating windows and
+dialogs default to client-side decoration until Ferese provides a complete
+compositor-drawn floating frame.
+
 ### 8.3 XWayland
 
 The desktop tier SHOULD use `xwayland-satellite`, launched on demand, so X11