[UI Bug] Inconsistent click behavior when switching between Layout and Menu dropdowns

[Jiafei-Queen]

Desktop

• OS: macOS
• OS version: 26.5.2 (25F84)
• Tauon Version: Latest Pre-release
• Installation method: GitHub release

Describe the bug
When switching between the top-level dropdown menus ("Layout" and "Menu"), the click behavior is asymmetrical and inconsistent:

• From Menu to Layout: Clicking the Layout button while the Menu is open switches to the Layout dropdown immediately (1 click).
• From Layout to Menu: Clicking the Menu button while the Layout is open requires 2 clicks (the first click closes the Layout menu, and the second click opens the Menu).

To Reproduce
Steps to reproduce the behavior:

1. Click the "Layout" button to open its dropdown menu.
2. Click the "Menu" button directly while the Layout menu is still open.
3. Notice that it takes two clicks on the Menu button for the menu to finally open.
4. (Conversely) Open the "Menu" dropdown and click the "Layout" button — it switches in just one click.

Expected behavior
Clicking either the Layout or Menu button should immediately toggle/switch to that menu with 1 click, regardless of which menu is currently open (mutually exclusive instant toggle).

Screenshots/Videos

Tauon log

Logfiles

(UI state/event handling bug, no Python traceback log required)