Is there an existing issue for this?

• I have searched the existing issues

Description of the Issue

When the menu bar is set to be hidden in Preferences... > General > Menu, it becomes invisible.
If you right-click on the title bar to open the system menu, the menu bar temporarily reappears. However, this change is not permanent—you cannot interact with the menu bar (with the mouse). Once you click elsewhere and the system menu is closed, the menu bar is hidden again.

Steps To Reproduce

1. Open Preferences... > General > Menu and check "Hide (use Alt or F10 key to toggle)" to hide the menu bar
2. In the main window, right-click on the title bar.
   --> The menu bar temporarily reappears.
3. Click anywhere else outside the system menu.
   --> The menu bar disappears again.

Current Behavior

The menu bar temporarily reappears when right-clicking on the title bar.

Expected Behavior

The menu bar should remain hidden and not reappear when the system menu is opened.

Debug Information

Notepad++ v8.8.1   (64-bit)
Build time : May  3 2025 - 18:41:09
Scintilla/Lexilla included : 5.5.6/5.4.4
Boost Regex included : 1_85
Path : C:\Program Files\Notepad++\notepad++.exe
Command Line : 
Admin mode : OFF
Local Conf mode : OFF
Cloud Config : OFF
Periodic Backup : ON
Placeholders : OFF
Scintilla Rendering Mode : SC_TECHNOLOGY_DEFAULT (0)
Multi-instance Mode : monoInst
File Status Auto-Detection : cdEnabledNew (for current file/tab only)
Dark Mode : OFF
OS Name : Windows 11 Pro (64-bit)
OS Version : 24H2
OS Build : 26100.4061
Current ANSI codepage : 1252
Plugins : 
    mimeTools (3.1)
    NppConverter (4.6)
    NppExport (0.4)

Anything else?

No response