ctlIME // Tweak tooltip axis during vertical typing.

Source/Modules/ControllerModules/ctlInputMethod_HandleDisplay.swift

@@ -26,7 +26,16 @@ extension ctlInputMethod {
       )
       cursor -= 1
     }
-    ctlInputMethod.tooltipController.show(tooltip: tooltip, at: lineHeightRect.origin)
+    var finalOrigin: NSPoint = lineHeightRect.origin
+    if isVerticalTyping {
+      finalOrigin = NSPoint(
+        x: lineHeightRect.origin.x + lineHeightRect.size.width + 4.0, y: lineHeightRect.origin.y - 4.0
+      )
+      ctlInputMethod.tooltipController.direction = .vertical
+    } else {
+      ctlInputMethod.tooltipController.direction = .horizontal
+    }
+    ctlInputMethod.tooltipController.show(tooltip: tooltip, at: finalOrigin)
   }
 
   func show(candidateWindowWith state: InputStateProtocol) {

Source/Modules/UIModules/TooltipUI/TooltipController.swift

@@ -20,6 +20,11 @@ public class TooltipController: NSWindowController {
     case prompt
   }
 
+  public enum displayDirection {
+    case horizontal
+    case vertical
+  }
+
   private var backgroundColor = NSColor.windowBackgroundColor
   private var textColor = NSColor.windowBackgroundColor
   private var messageTextField: NSTextField
@@ -30,6 +35,8 @@ public class TooltipController: NSWindowController {
     }
   }
 
+  public var direction: displayDirection = .horizontal
+
   public init() {
     let contentRect = NSRect(x: 128.0, y: 128.0, width: 300.0, height: 20.0)
     let styleMask: NSWindow.StyleMask = [.borderless, .nonactivatingPanel]
@@ -157,6 +164,7 @@ public class TooltipController: NSWindowController {
     var rect = attrString.boundingRect(
       with: NSSize(width: 1600.0, height: 1600.0), options: .usesLineFragmentOrigin
     )
+
     rect.size.width += 10
     messageTextField.frame = rect
     window?.setFrame(rect, display: true)