fix: quick terminal focus-follows-mouse behaviour

Quick Terminal now focuses on the surface under the mouse
pointer when `focus-follows-mouse` is enabled.

Fixes #3337

macos/Sources/Features/Terminal/BaseTerminalController.swift

@@ -45,6 +45,11 @@ class BaseTerminalController: NSWindowController,
         didSet { surfaceTreeDidChange(from: oldValue, to: surfaceTree) }
     }
 
+    /// Whether the terminal surface should focus when the mouse is over it.
+    var focusFollowsMouse: Bool {
+        self.derivedConfig.focusFollowsMouse
+    }
+
     /// Non-nil when an alert is active so we don't overlap multiple.
     private var alert: NSAlert? = nil
 
@@ -262,7 +267,6 @@ class BaseTerminalController: NSWindowController,
         
         // Set the main window title
         window.title = to
-
     }
     
     func pwdDidChange(to: URL?) {
@@ -604,15 +608,18 @@ class BaseTerminalController: NSWindowController,
     private struct DerivedConfig {
         let macosTitlebarProxyIcon: Ghostty.MacOSTitlebarProxyIcon
         let windowStepResize: Bool
+        let focusFollowsMouse: Bool
 
         init() {
             self.macosTitlebarProxyIcon = .visible
             self.windowStepResize = false
+            self.focusFollowsMouse = false
         }
 
         init(_ config: Ghostty.Config) {
             self.macosTitlebarProxyIcon = config.macosTitlebarProxyIcon
             self.windowStepResize = config.windowStepResize
+            self.focusFollowsMouse = config.focusFollowsMouse
         }
     }
 }

macos/Sources/Features/Terminal/TerminalController.swift

@@ -117,9 +117,6 @@ class TerminalController: BaseTerminalController {
             // Update our derived config
             self.derivedConfig = DerivedConfig(config)
 
-            guard let window = window as? TerminalWindow else { return }
-            window.focusFollowsMouse = config.focusFollowsMouse
-
             // If we have no surfaces in our window (is that possible?) then we update
             // our window appearance based on the root config. If we have surfaces, we
             // don't call this because the TODO
@@ -422,8 +419,6 @@ class TerminalController: BaseTerminalController {
             }
         }
 
-        window.focusFollowsMouse = config.focusFollowsMouse
-
         // Apply any additional appearance-related properties to the new window. We
         // apply this based on the root config but change it later based on surface
         // config (see focused surface change callback).

macos/Sources/Features/Terminal/TerminalWindow.swift

@@ -414,8 +414,6 @@ class TerminalWindow: NSWindow {
         }
     }
 
-    var focusFollowsMouse: Bool = false
-
     // Find the NSTextField responsible for displaying the titlebar's title.
     private var titlebarTextField: NSTextField? {
         guard let titlebarView = titlebarContainer?.subviews

macos/Sources/Ghostty/SurfaceView_AppKit.swift

@@ -617,11 +617,12 @@ extension Ghostty {
             let mods = Ghostty.ghosttyMods(event.modifierFlags)
             ghostty_surface_mouse_pos(surface, pos.x, frame.height - pos.y, mods)
 
-            // If focus follows mouse is enabled then move focus to this surface.
+            // Handle focus-follows-mouse
-            if let window = self.window as? TerminalWindow,
+            if let window,
-               window.isKeyWindow &&
+               let controller = window.windowController as? BaseTerminalController,
-                window.focusFollowsMouse &&
+               (window.isKeyWindow &&
-                !self.focused
+                    !self.focused &&
+                    controller.focusFollowsMouse)
             {
                 Ghostty.moveFocus(to: self)
             }