Description of the Issue

If you have a large document with several thousand (most empty, some not) lines: Use Edit > Line Operations > Remove Empty Lines, the program freezes for a long time as it takes forever to complete. A workaround is to first remove duplicate lines (which is very fast) and then remove the remaining empty line(s) manually.

Steps to Reproduce the Issue

1. Have a large document 2000+ lines, with say 80% empty lines (mostly \r\n, some with a space).
2. Edit > Line Operations > Remove Empty Lines.
3. This takes a long, long time.

Expected Behavior

Should be quick.

Actual Behavior

Is slow.

Debug Information

Notepad++ v8.3 (64-bit)
Build time : Feb 3 2022 - 03:39:05
Path : D:\Notepad++\notepad++.exe
Command Line :
Admin mode : OFF
Local Conf mode : ON
Cloud Config : OFF
OS Name : Windows 10 Pro (64-bit)
OS Version : 2009
OS Build : 19044.2130
Current ANSI codepage : 1252
Plugins : JSMinNPP.dll mimeTools.dll NppConverter.dll NppExport.dll