notepad-plus-plus / notepad-plus-plus/notepad-plus-plus

[BUG] Tab activation can yield two buffer-activated notifications

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C++
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Description

Is there an existing issue for this?
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Description of the Issue

See Community discussion here: https://community.notepad-plus-plus.org/topic/26799/two-buffer-activated-notifications-instead-of-just-one

Steps To Reproduce
  1. have 2 tabs open in each view
  2. in the inactive view, click on the inactive tab
Current Behavior

Two of these notifications occur: https://npp-user-manual.org/docs/plugin-communication/#1010nppn_bufferactivated

The first one is for the tab currently active in the initially inactive view, the second one is for the tab being made active in that same view.

Expected Behavior

Only one notification should occur.

Debug Information
Notepad++ v8.8   (64-bit)
Build time : Apr 24 2025 - 02:59:05
Scintilla/Lexilla included : 5.5.6/5.4.4
Boost Regex included : 1_85
Path : C:\NotepadPlusPlus\Misc\_NoBackup\Releases\npp.8.8\npp.8.8.portable.x64\notepad++.exe
Command Line : -multiInst
Admin mode : OFF
Local Conf mode : ON
Cloud Config : OFF
Periodic Backup : ON
Placeholders : OFF
Scintilla Rendering Mode : SC_TECHNOLOGY_DIRECTWRITE (1)
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 : 26100.3775
Current ANSI codepage : 1252
Plugins : 
    mimeTools (3.1)
    NppConverter (4.6)
    NppExport (0.4)
Anything else?

No response

Contributor guide

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First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

Reproduce the two-view, two-tab scenario and trace handling of the NPPN_BUFFERACTIVATED notification described in the issue and linked plugin-communication documentation. Confirm that activating a tab in the inactive view emits only one notification, then verify the behavior with the same reproduction steps.

Written by the indexing model from the issue text.

Assessment

Tech stack
cpp
Domain
desktop
Issue type
Bug
Difficulty
4/5
Estimated time
3-5 days
Activity status
Stale
Clarity
Mostly clear
Newbie friendliness
38/100

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