feat(borders): add windows accent implementation

This commit adds the ability for users to select between komorebi's
implementation of borders with variable widths and the native Windows 11
implementation of thin "accent" borders.

The new border_implementation configuration option defaults to
BorderImplementation::Komorebi in order to preserve compat with existing
user configurations.

This option will be most useful for people who prefer ultra-thin
borders, and people who want borders to be animated along with
application windows if they are using the animation feature being worked
on in PR #685.

komorebi-core/src/lib.rs

@@ -142,6 +142,7 @@ pub enum SocketMessage {
     BorderStyle(BorderStyle),
     BorderWidth(i32),
     BorderOffset(i32),
+    BorderImplementation(BorderImplementation),
     Transparency(bool),
     TransparencyAlpha(u8),
     InvisibleBorders(Rect),
@@ -219,7 +220,17 @@ pub enum StackbarLabel {
 }
 
 #[derive(
-    Default, Copy, Clone, Debug, Eq, PartialEq, Display, Serialize, Deserialize, JsonSchema,
+    Default,
+    Copy,
+    Clone,
+    Debug,
+    Eq,
+    PartialEq,
+    Display,
+    Serialize,
+    Deserialize,
+    JsonSchema,
+    ValueEnum,
 )]
 pub enum BorderStyle {
     #[default]
@@ -231,6 +242,27 @@ pub enum BorderStyle {
     Square,
 }
 
+#[derive(
+    Default,
+    Copy,
+    Clone,
+    Debug,
+    Eq,
+    PartialEq,
+    Display,
+    Serialize,
+    Deserialize,
+    JsonSchema,
+    ValueEnum,
+)]
+pub enum BorderImplementation {
+    #[default]
+    /// Use the adjustable komorebi border implementation
+    Komorebi,
+    /// Use the thin Windows accent border implementation
+    Windows,
+}
+
 #[derive(
     Copy,
     Clone,

komorebi/src/border_manager/border.rs

@@ -1,12 +1,9 @@
+use crate::border_manager::window_kind_colour;
 use crate::border_manager::WindowKind;
 use crate::border_manager::BORDER_OFFSET;
 use crate::border_manager::BORDER_WIDTH;
-use crate::border_manager::FOCUSED;
 use crate::border_manager::FOCUS_STATE;
-use crate::border_manager::MONOCLE;
-use crate::border_manager::STACK;
 use crate::border_manager::STYLE;
-use crate::border_manager::UNFOCUSED;
 use crate::border_manager::Z_ORDER;
 use crate::WindowsApi;
 use crate::WINDOWS_11;
@@ -165,7 +162,7 @@ impl Border {
                     match WindowsApi::window_rect(window) {
                         Ok(rect) => {
                             // Grab the focus kind for this border
-                            let focus_kind = {
+                            let window_kind = {
                                 FOCUS_STATE
                                     .lock()
                                     .get(&window.0)
@@ -177,12 +174,7 @@ impl Border {
                             let hpen = CreatePen(
                                 PS_SOLID | PS_INSIDEFRAME,
                                 BORDER_WIDTH.load(Ordering::SeqCst),
-                                COLORREF(match focus_kind {
-                                    WindowKind::Unfocused => UNFOCUSED.load(Ordering::SeqCst),
-                                    WindowKind::Single => FOCUSED.load(Ordering::SeqCst),
-                                    WindowKind::Stack => STACK.load(Ordering::SeqCst),
-                                    WindowKind::Monocle => MONOCLE.load(Ordering::SeqCst),
-                                }),
+                                COLORREF(window_kind_colour(window_kind)),
                             );
 
                             let hbrush = WindowsApi::create_solid_brush(0);