refactor(shell/element): refactor how decorations height is accessed

This fixes several things:
- The xwayland code previously incorrectly used the SSD_HEIGHT (for Windows) even when the X11 surface was in a stack
- The SSD_HEIGHT was defined in surface.rs, even though rendering serverside decorations is done in the window/stack

Rename (min|max)_size to (min|max)_size_without_ssd in CosmicSurface and make it act accordingly
Add a new (min|max)_size() in CosmicWindow and CosmicStack, which takes the surface's (min|max)_size and adds the decorations.
Change all callers to use (min|max)_size() from the window or stack respectively, except is_dialog() where it does not matter.

src/shell/element/mod.rs

@@ -468,61 +468,16 @@ impl CosmicMapped {
 
     pub fn min_size(&self) -> Option<Size<i32, Logical>> {
         match &self.element {
-            CosmicMappedInternal::Stack(stack) => {
+            CosmicMappedInternal::Stack(stack) => stack.min_size(),
-                stack.surfaces().fold(None, |min_size, window| {
+            CosmicMappedInternal::Window(window) => window.min_size(),
-                    let win_min_size = window.min_size();
-                    match (min_size, win_min_size) {
-                        (None, None) => None,
-                        (None, x) | (x, None) => x,
-                        (Some(min1), Some(min2)) => {
-                            Some((min1.w.max(min2.w), min1.h.max(min2.h)).into())
-                        }
-                    }
-                })
-            }
-            CosmicMappedInternal::Window(window) => window.surface().min_size(),
             _ => unreachable!(),
         }
     }
 
     pub fn max_size(&self) -> Option<Size<i32, Logical>> {
         match &self.element {
-            CosmicMappedInternal::Stack(stack) => {
+            CosmicMappedInternal::Stack(stack) => stack.max_size(),
-                let theoretical_max = stack.surfaces().fold(None, |max_size, window| {
+            CosmicMappedInternal::Window(window) => window.max_size(),
-                    let win_max_size = window.max_size();
-                    match (max_size, win_max_size) {
-                        (None, None) => None,
-                        (None, x) | (x, None) => x,
-                        (Some(max1), Some(max2)) => Some(
-                            (
-                                if max1.w == 0 {
-                                    max2.w
-                                } else if max2.w == 0 {
-                                    max1.w
-                                } else {
-                                    max1.w.min(max2.w)
-                                },
-                                if max1.h == 0 {
-                                    max2.h
-                                } else if max2.h == 0 {
-                                    max1.h
-                                } else {
-                                    max1.h.min(max2.h)
-                                },
-                            )
-                                .into(),
-                        ),
-                    }
-                });
-                // The problem is, with accumulated sizes, the minimum size could be larger than our maximum...
-                let min_size = self.min_size();
-                match (theoretical_max, min_size) {
-                    (None, _) => None,
-                    (Some(max), None) => Some(max),
-                    (Some(max), Some(min)) => Some((max.w.max(min.w), max.h.max(min.h)).into()),
-                }
-            }
-            CosmicMappedInternal::Window(window) => window.surface().max_size(),
             _ => unreachable!(),
         }
     }
@@ -911,6 +866,15 @@ impl CosmicMapped {
             _ => unreachable!(),
         })
     }
+
+    pub fn ssd_height(&self, pending: bool) -> Option<i32> {
+        match &self.element {
+            CosmicMappedInternal::Window(w) => (!w.surface().is_decorated(pending))
+                .then(|| crate::shell::element::window::SSD_HEIGHT),
+            CosmicMappedInternal::Stack(s) => Some(crate::shell::element::stack::TAB_HEIGHT),
+            _ => unreachable!(),
+        }
+    }
 }
 
 impl IsAlive for CosmicMapped {

src/shell/element/stack.rs

@@ -1,4 +1,7 @@
-use super::{surface::RESIZE_BORDER, window::Focus, CosmicSurface};
+use super::{
+    window::{Focus, RESIZE_BORDER},
+    CosmicSurface,
+};
 use crate::{
     backend::render::cursor::CursorState,
     shell::{
@@ -658,6 +661,59 @@ impl CosmicStack {
             }
         }
     }
+
+    pub fn min_size(&self) -> Option<Size<i32, Logical>> {
+        self.surfaces()
+            .fold(None, |min_size, window| {
+                let win_min_size = window.min_size_without_ssd();
+                match (min_size, win_min_size) {
+                    (None, None) => None,
+                    (None, x) | (x, None) => x,
+                    (Some(min1), Some(min2)) => {
+                        Some((min1.w.max(min2.w), min1.h.max(min2.h)).into())
+                    }
+                }
+            })
+            .map(|size| size + (0, TAB_HEIGHT).into())
+    }
+    pub fn max_size(&self) -> Option<Size<i32, Logical>> {
+        let theoretical_max = self
+            .surfaces()
+            .fold(None, |max_size, window| {
+                let win_max_size = window.max_size_without_ssd();
+                match (max_size, win_max_size) {
+                    (None, None) => None,
+                    (None, x) | (x, None) => x,
+                    (Some(max1), Some(max2)) => Some(
+                        (
+                            if max1.w == 0 {
+                                max2.w
+                            } else if max2.w == 0 {
+                                max1.w
+                            } else {
+                                max1.w.min(max2.w)
+                            },
+                            if max1.h == 0 {
+                                max2.h
+                            } else if max2.h == 0 {
+                                max1.h
+                            } else {
+                                max1.h.min(max2.h)
+                            },
+                        )
+                            .into(),
+                    ),
+                }
+            })
+            .map(|size| size + (0, TAB_HEIGHT).into());
+        // The problem is, with accumulated sizes, the minimum size could be larger than our maximum...
+        let min_size = self.min_size();
+        match (theoretical_max, min_size) {
+            (None, _) => None,
+            (Some(max), None) => Some(max),
+            (Some(max), Some(min)) => Some((max.w.max(min.w), max.h.max(min.h)).into()),
+        }
+    }
 }
 
 #[derive(Debug, Clone, Copy)]

src/shell/element/surface.rs

@@ -94,9 +94,6 @@ struct Sticky(AtomicBool);
 #[derive(Default)]
 struct GlobalGeometry(Mutex<Option<Rectangle<i32, Global>>>);
 
-pub const SSD_HEIGHT: i32 = 36;
-pub const RESIZE_BORDER: i32 = 10;
-
 impl CosmicSurface {
     pub fn title(&self) -> String {
         match self.0.underlying_surface() {
@@ -451,7 +448,7 @@ impl CosmicSurface {
         }
     }
 
-    pub fn min_size(&self) -> Option<Size<i32, Logical>> {
+    pub fn min_size_without_ssd(&self) -> Option<Size<i32, Logical>> {
         match self.0.underlying_surface() {
             WindowSurface::Wayland(toplevel) => {
                 Some(with_states(toplevel.wl_surface(), |states| {
@@ -465,16 +462,9 @@ impl CosmicSurface {
             }
             WindowSurface::X11(surface) => surface.min_size(),
         }
-        .map(|size| {
-            if self.is_decorated(false) {
-                size
-            } else {
-                size + (0, SSD_HEIGHT).into()
-            }
-        })
     }
 
-    pub fn max_size(&self) -> Option<Size<i32, Logical>> {
+    pub fn max_size_without_ssd(&self) -> Option<Size<i32, Logical>> {
         match self.0.underlying_surface() {
             WindowSurface::Wayland(toplevel) => {
                 Some(with_states(toplevel.wl_surface(), |states| {
@@ -488,13 +478,6 @@ impl CosmicSurface {
             }
             WindowSurface::X11(surface) => surface.max_size(),
         }
-        .map(|size| {
-            if self.is_decorated(false) {
-                size
-            } else {
-                size + (0, SSD_HEIGHT).into()
-            }
-        })
     }
 
     pub fn serial_acked(&self, serial: &Serial) -> bool {

src/shell/element/window.rs

@@ -55,10 +55,10 @@ use std::{
 };
 use wayland_backend::server::ObjectId;
 
-use super::{
+use super::CosmicSurface;
-    surface::{RESIZE_BORDER, SSD_HEIGHT},
+
-    CosmicSurface,
+pub const SSD_HEIGHT: i32 = 36;
-};
+pub const RESIZE_BORDER: i32 = 10;
 
 #[derive(Clone, PartialEq, Eq, Hash)]
 pub struct CosmicWindow(pub(super) IcedElement<CosmicWindowInternal>);
@@ -386,6 +386,29 @@ impl CosmicWindow {
     pub(crate) fn force_redraw(&self) {
         self.0.force_redraw();
     }
+
+    pub fn min_size(&self) -> Option<Size<i32, Logical>> {
+        self.0
+            .with_program(|p| p.window.min_size_without_ssd())
+            .map(|size| {
+                if self.0.with_program(|p| !p.window.is_decorated(false)) {
+                    size + (0, SSD_HEIGHT).into()
+                } else {
+                    size
+                }
+            })
+    }
+    pub fn max_size(&self) -> Option<Size<i32, Logical>> {
+        self.0
+            .with_program(|p| p.window.max_size_without_ssd())
+            .map(|size| {
+                if self.0.with_program(|p| !p.window.is_decorated(false)) {
+                    size + (0, SSD_HEIGHT).into()
+                } else {
+                    size
+                }
+            })
+    }
 }
 
 #[derive(Debug, Clone, Copy)]

src/shell/layout/mod.rs

@@ -44,8 +44,8 @@ pub fn is_dialog(window: &CosmicSurface) -> bool {
     };
 
     // Check if sizing suggest dialog
-    let max_size = window.max_size();
+    let max_size = window.max_size_without_ssd();
-    let min_size = window.min_size();
+    let min_size = window.min_size_without_ssd();
 
     if min_size.is_some() && min_size == max_size {
         return true;

src/xwayland.rs

@@ -2,10 +2,7 @@ use std::{ffi::OsString, os::unix::io::OwnedFd, process::Stdio};
 
 use crate::{
     backend::render::cursor::{load_cursor_theme, Cursor},
-    shell::{
+    shell::{focus::target::KeyboardFocusTarget, grabs::ReleaseMode, CosmicSurface, Shell},
-        element::surface::SSD_HEIGHT, focus::target::KeyboardFocusTarget, grabs::ReleaseMode,
-        CosmicSurface, Shell,
-    },
     state::State,
     utils::prelude::*,
     wayland::handlers::{
@@ -473,7 +470,7 @@ impl XwmHandler for State {
             };
 
             if let Some(current_geo) = current_geo {
-                let ssd_height = if window.is_decorated() { 0 } else { SSD_HEIGHT };
+                let ssd_height = mapped.ssd_height(false).unwrap_or(0);
                 mapped.set_geometry(Rectangle::from_loc_and_size(
                     current_geo.loc,
                     (