[Feature request] <Prevent pinned tabs from being closed>

Is there an existing issue for this?

• I have searched the existing issues

Description of the Issue

Current tab pinning moved tabs to leftmost position, but it still can be closed while it is pinned.

Describe the solution you'd like.

In addition to moving to the left, also prevent the tab from being closed.

Debug Information

Notepad++ v8.7.4   (64-bit)
Build time : Dec  4 2024 - 23:50:05
Path : C:\Programs\Text Editors\X-Notepad++\notepad++.exe
Command Line : "C:\[Backup]\Dropbox\NICS\_BD\Unit 04\4.5b - Christ's Kenosis.txt"
Admin mode : ON
Local Conf mode : ON
Cloud Config : OFF
Periodic Backup : OFF
Placeholders : OFF
DirectWrite : ON
Multi-instance Mode : multiInstOnSession
File Status Auto-Detection : cdEnabledOld (for all opened files/tabs) + cdAutoUpdate + cdGo2end
Dark Mode : ON
OS Name : Windows 10 Pro (64-bit)
OS Version : 22H2
OS Build : 19045.5131
Current ANSI codepage : 1252
Plugins : 
    AutoSave (1.6.1)
    ComparePlugin (2.0.2)
    DSpellCheck (1.4.24)
    HexEditor (0.9.12)
    MarkdownViewerPlusPlus (0.8.2)
    mimeTools (3.1)
    NppConverter (4.6)
    NppExport (0.4)
    NppMarkdownPanel (0.6.1)
    NppSnippets (1.7)
    SessionMgr (1.4.4)

Anything else?

No response

Start by tracing how pinned tabs are identified and how tab-close actions are handled in the desktop application. The issue provides no file or test locations, so first locate those entry points and inspect existing tab-pinning behavior. Done means a pinned tab remains open when a close action is attempted while unpinned tabs retain their current behavior.