Improve split and tab navigation behavior

macos/Sources/Ghostty/Ghostty.App.swift

@@ -773,8 +773,20 @@ extension Ghostty {
                     return
 
                 case GHOSTTY_TARGET_SURFACE:
-                    guard let surface = target.target.surface else { return }
+                    guard let surface = target.target.surface,
-                    guard let surfaceView = self.surfaceView(from: surface) else { return }
+                          let surfaceView = self.surfaceView(from: surface),
+                          let window = surfaceView.window,
+                          let controller = window.windowController as? TerminalController,
+                          let surfaceTree = controller.surfaceTree else { return }
+
+                    if !surfaceTree.isViewInSplit(surfaceView) &&
+                    (direction == GHOSTTY_GOTO_SPLIT_NEXT || direction == GHOSTTY_GOTO_SPLIT_PREVIOUS) {
+                        let tabDirection: ghostty_action_goto_tab_e = direction == GHOSTTY_GOTO_SPLIT_NEXT ?
+                            GHOSTTY_GOTO_TAB_NEXT : GHOSTTY_GOTO_TAB_PREVIOUS
+                        gotoTab(app, target: target, tab: tabDirection)
+                        return
+                    }
+
                     NotificationCenter.default.post(
                         name: Notification.ghosttyFocusSplit,
                         object: surfaceView,

macos/Sources/Ghostty/Ghostty.SplitNode.swift

@@ -130,6 +130,15 @@ extension Ghostty {
             }
         }
 
+        /// Returns true if the view is in a split (not a single leaf)
+        func isViewInSplit(_ view: SurfaceView) -> Bool {
+            if case .split = self {
+                return contains(view: view)
+            }
+            return false
+        }
+
+
         /// Find a surface view by UUID.
         func findUUID(uuid: UUID) -> SurfaceView? {
             switch (self) {