[Bug]: "Sort Lines" inserts additional blank lines

[geniuszxy]

Notepad3 version

7.26.602.1

Build / architecture

Win32 (x86)

Windows version & build

Windows 10 22H2 19045.6282

Last known good Notepad3 version (regression only)

No response

Steps to reproduce

ssd-trans1.txt

When I perform the "Sort Lines" on the file above, additional blank lines will be inserted after certain specific lines. When the file is CRLF, an additional CR is inserted, and when the file is LF, an additional LF is inserted. (See actual behaviour for screenshots)

Expected behavior

Just sort lines.

Actual behavior

Additional context

No response

Version & system info (paste from About dialog)

Notepad3 (x64) 7.26.813.1 (1e2b6b77)
Compiler: MS Visual C++ 2022 v17.14.(22-26) (VC v1944)
OS Version: Windows 10  Version 22H2 (Build 19045)
Windows Colors 'Dark-Mode' Theme is NO SUPPORTED.
Scintilla v564
Lexilla v551
PCRE2 v10.47
- Process is not elevated
- User is in Admin-Group.
- Locale -> en-US (CP:'ANSI (CP-936)')
- Default Encoding -> 'Unicode (UTF-8)'
- Current Encoding -> 'Unicode (UTF-8)'
- Screen-Resolution -> 1920 x 1080 [pix]
- Display-DPI -> 96 x 96  (Scale: 100%).
- Main-Window -> top-left (0, 192), size 943 x 1080 [pix]
- Rendering-Technology -> 'GDI'
- Zoom -> 100%.
- Current Lexer -> 'Text Files'

Confirmation

• I searched existing issues and this is not a duplicate.
• I can reproduce this on a clean install (or a fresh INI via Notepad3 /i), not only with my customized config.
• If attaching Notepad3.ini: I've reviewed it for sensitive entries ([Recent Files], [Recent Find], [Recent Replace], Favorites=, DefaultDirectory=) and redacted what I don't want to share publicly.

[hpwamr]

Hello @geniuszxy ,
Using Notepad3 (x64) 7.26.715.1 beta, I'm not able to reproduce your issue. 🤔

Notepad3 (x64) 7.26.715.1 beta (1f18b8cc)
Compiler: MS Visual C++ 2026 v18.8.0 (VC v1951)
OS Version: Windows 11  Version 25H2 (Build 26200)
Windows Colors 'Dark-Mode' Theme is NO SUPPORTED.
Scintilla v564
Lexilla v551
PCRE2 v10.47
- Process is not elevated
- User is in Admin-Group.
- Locale -> en-GB (CP:'ANSI (CP-1252)')
- Default Encoding -> 'Unicode (UTF-8)'
- Current Encoding -> 'Unicode (UTF-8)'
- Screen-Resolution -> 1920 x 1080 [pix]
- Display-DPI -> 96 x 96  (Scale: 100%).
- Main-Window -> top-left (0, 954), size 972 x 1046 [pix]
- Rendering-Technology -> 'DIRECT-WRITE'
- Zoom -> 100%.
- Current Lexer -> 'Text Files'

[geniuszxy]

Hi @hpwamr,
The version number I generated with the latest code is 7.26.813.1. This issue is due to the StrTrimA() function, which is a Windows API, so is it possible that this is related to the version of Windows? Can you take a look at the link in the PR? I think if there were no changes made to this part, it should still exist.