SessionCtl // Change how updateVerticalTypingStatus() gets triggered.

Source/Modules/SessionCtl_Core.swift

@@ -106,14 +106,12 @@ public class SessionCtl: IMKInputController {
       isVerticalTyping = false
       return
     }
-    DispatchQueue.main.async {
     var textFrame = NSRect.seniorTheBeast
     let attributes: [AnyHashable: Any]? = client.attributes(
       forCharacterIndex: 0, lineHeightRectangle: &textFrame
     )
     let result = (attributes?["IMKTextOrientation"] as? NSNumber)?.intValue == 0 || false
-      self.isVerticalTyping = result
-    }
+    isVerticalTyping = result
   }
 
   /// InputMode 需要在每次出現內容變更的時候都連帶重設組字器與各項語言模組，
@@ -213,7 +211,6 @@ extension SessionCtl {
   public override func activateServer(_ sender: Any!) {
     _ = sender  // 防止格式整理工具毀掉與此對應的參數。
     DispatchQueue.main.async { [self] in
-      defer { updateVerticalTypingStatus() }
       if let senderBundleID: String = (sender as? IMKTextInput)?.bundleIdentifier() {
         vCLog("activateServer(\(senderBundleID))")
         isServingIMEItself = Bundle.main.bundleIdentifier == senderBundleID

Source/Modules/SessionCtl_HandleDisplay.swift

@@ -73,6 +73,7 @@ extension SessionCtl {
 
   public func showCandidates() {
     guard let client = client() else { return }
+    updateVerticalTypingStatus()
     state.isVerticalCandidateWindow = (isVerticalTyping || !PrefMgr.shared.useHorizontalCandidateList)
 
     /// 無論是田所選字窗還是 IMK 選字窗，在這裡都有必要重新初期化。

Source/Modules/SessionCtl_HandleEvent.swift

@@ -119,6 +119,7 @@ extension SessionCtl {
 
     // 如果是方向鍵輸入的話，就想辦法帶上標記資訊、來說明當前是縱排還是橫排。
     if event.isUp || event.isDown || event.isLeft || event.isRight {
+      updateVerticalTypingStatus()  // 檢查當前環境是否是縱排輸入。
       eventToDeal = event.reinitiate(charactersIgnoringModifiers: isVerticalTyping ? "Vertical" : "Horizontal") ?? event
     }