macos: simplify terminal controller a bunch

macos/Sources/Features/Terminal/TerminalController.swift

@@ -54,16 +54,6 @@ class TerminalController: BaseTerminalController, TabGroupCloseCoordinator.Contr
     /// The configuration derived from the Ghostty config so we don't need to rely on references.
     private(set) var derivedConfig: DerivedConfig
 
-    /// The accent color that should be rendered for this tab.
-    var tabColor: TerminalTabColor = .none {
-        didSet {
-            guard tabColor != oldValue else { return }
-            if let terminalWindow = window as? TerminalWindow {
-                terminalWindow.display(tabColor: tabColor)
-            }
-            window?.invalidateRestorableState()
-        }
-    }
 
     /// The notification cancellable for focused surface property changes.
     private var surfaceAppearanceCancellables: Set<AnyCancellable> = []
@@ -870,12 +860,14 @@ class TerminalController: BaseTerminalController, TabGroupCloseCoordinator.Contr
          with undoState: UndoState
     ) {
         self.init(ghostty, withSurfaceTree: undoState.surfaceTree)
-        self.tabColor = undoState.tabColor
 
         // Show the window and restore its frame
         showWindow(nil)
         if let window {
             window.setFrame(undoState.frame, display: true)
+            if let terminalWindow = window as? TerminalWindow {
+                terminalWindow.tabColor = undoState.tabColor
+            }
 
             // If we have a tab group and index, restore the tab to its original position
             if let tabGroup = undoState.tabGroup,
@@ -912,7 +904,7 @@ class TerminalController: BaseTerminalController, TabGroupCloseCoordinator.Contr
             focusedSurface: focusedSurface?.id,
             tabIndex: window.tabGroup?.windows.firstIndex(of: window),
             tabGroup: window.tabGroup,
-            tabColor: tabColor)
+            tabColor: (window as? TerminalWindow)?.tabColor ?? .none)
     }
 
     //MARK: - NSWindowController
@@ -954,9 +946,6 @@ class TerminalController: BaseTerminalController, TabGroupCloseCoordinator.Contr
             delegate: self,
         ))
 
-        if let terminalWindow = window as? TerminalWindow {
-            terminalWindow.display(tabColor: tabColor)
-        }
         // If we have a default size, we want to apply it.
         if let defaultSize {
             switch (defaultSize) {
@@ -1195,11 +1184,6 @@ class TerminalController: BaseTerminalController, TabGroupCloseCoordinator.Contr
         }
     }
 
-
-    func setTabColor(_ color: TerminalTabColor) {
-        tabColor = color
-    }
-
     @IBAction func returnToDefaultSize(_ sender: Any?) {
         guard let window, let defaultSize else { return }
         defaultSize.apply(to: window)

macos/Sources/Features/Terminal/TerminalRestorable.swift

@@ -15,7 +15,7 @@ class TerminalRestorableState: Codable {
         self.focusedSurface = controller.focusedSurface?.id.uuidString
         self.surfaceTree = controller.surfaceTree
         self.effectiveFullscreenMode = controller.fullscreenStyle?.fullscreenMode
-        self.tabColor = controller.tabColor
+        self.tabColor = (controller.window as? TerminalWindow)?.tabColor ?? .none
     }
 
     init?(coder aDecoder: NSCoder) {
@@ -97,7 +97,8 @@ class TerminalWindowRestoration: NSObject, NSWindowRestoration {
             return
         }
 
-        c.tabColor = state.tabColor
+        // Restore our tab color
+        (window as? TerminalWindow)?.tabColor = state.tabColor
 
         // Setup our restored state on the controller
         // Find the focused surface in surfaceTree

macos/Sources/Features/Terminal/Window Styles/TerminalWindow.swift

@@ -46,8 +46,13 @@ class TerminalWindow: NSWindow {
         windowController as? TerminalController
     }
 
-    func display(tabColor: TerminalTabColor) {
-        tabColorSelection = tabColor
+    var tabColor: TerminalTabColor {
+        get { tabColorSelection }
+        set {
+            guard tabColorSelection != newValue else { return }
+            tabColorSelection = newValue
+            invalidateRestorableState()
+        }
     }
 
     // MARK: NSWindow Overrides
@@ -756,7 +761,7 @@ extension TerminalWindow {
         paletteItem.view = makeTabColorPaletteView(
             selectedColor: tabColorSelection
         ) { [weak target] color in
-            target?.setTabColor(color)
+            (target?.window as? TerminalWindow)?.tabColor = color
         }
         menu.addItem(paletteItem)
     }