@PeterJones
Thank you for your reply and for all the effort to answer my question!

Sorry I wasn’t clear enough: I wanted to say that I want to change the background color for all the lines before that line containing the word STARTCODE, so your second answer is what I need.
However, it works but once I close the EnhanceAnyLexerConfig.ini or I simply start editing the “startcode.txt” file, the graying is gone for those lines before STARTCODE

And another question is: how can I change the background color instead of the ink color?

winget install Notepad++.Notepad++

I think the sandbox has winget. It has been a while since I have used it. Use -i if you want to select install options.

@Steve-Rhoads said in Line wrap on line 1000 can cause continual wiggles:

For Notepad++ v8.8.6, if there is a file that is more than 1000 lines long, and line wrap is enabled, and line 1000 is longer than the screen width by only one character, and then scroll until line 1000 is at the bottom of the screen, then the text constantly wiggles back and forth horizontally by one character.

I do not see that. It is perfectly still for me, looking like the following screenshot, with no flashing:

1362a4c1-00b7-41ae-a9fd-2415aa7a0afa-image.png

(yes, I know that my still screenshot wouldn’t show a wiggle… my point it, it looks still to me, just like a static screenshot does, no wiggle.)

File size might have something to do with it: my screenshot shows I’m on line 1000 of a 1000 line file, with about 100000 characters. If you’ve got a lot of lines beyond the wrap margin, rather than just 1 like my example, maybe it would behave differently.

Also, Settings > Preferences > Margins/Borders/Edge has the dynamic-vs-static width for line number display: maybe switching to static would solve your problem, so N++ isn’t trying to resize the margin as it goes from 999 to 1000 for you?

Notepad++ v8.8.6 (64-bit) Build time: Oct 7 2025 - 13:44:28 Scintilla/Lexilla included: 5.5.7/5.4.5 Boost Regex included: 1_85 Path: C:\usr\local\apps\npp\npp.8.8.6.portable.x64\notepad++.exe Command Line: 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 asNotepad: OFF File Status Auto-Detection: cdEnabledNew (for current file/tab only) Dark Mode: OFF Display Info: primary monitor: 1920x1080, scaling 100% visible monitors count: 1 installed Display Class adapters: 0000: Description - Intel(R) UHD Graphics 770 0000: DriverVersion - 32.0.101.6881 OS Name: Windows 11 Home (64-bit) OS Version: 24H2 OS Build: 26100.6899 Current ANSI codepage: 1252 Plugins: ColumnsPlusPlus (1.2) mimeTools (3.1) NppConverter (4.7) NppExport (0.4)

If you share your ?-menu’s Debug Info, like I did, it might give some sort of clue. For example, if you have a lot of plugins, there might be a plugin interaction issue (in which case, the “Possible Culprit: Plugin” section of this FAQ may help you narrow down which plugin is the culprit. Also, sometimes there are issues with certain graphics card drivers, or similar such things, which is why that information is listed in the Debug Info: with all that information, one of the forum regulars who is better with that sort of problem will probably be able to give you some ideas.