https://community.notepad-plus-plus.org/topic/25707/why-sci_appendtext-changed-npp-default-background/5
why SCI_APPENDTEXT changed NPP default background? | Notepad++ Community
Apr 22, 2024 - @rdipardo Perfect, with your guide, my code works well again, thanks!
why sciappendtextchangednppdefault
https://learn.microsoft.com/en-us/dotnet/api/system.windows.forms.textboxbase.appendtext?redirectedfrom=MSDN&view=netframework-4.7.2
TextBoxBase.AppendText(String) Method (System.Windows.Forms) | Microsoft Learn
Appends text to the current text of a text box.
windows formsappendtextstringmethodsystem