Weird bug in NP++ editor, making it difficult to edit files

[grouillard]

Description of the Issue

I use NP ++ on several of my computers and the software works perfectly fine on all but one, the one I mainly use for work.

It's a well-equipped Windows 10 workstation, with two 4K displays hooked up to a decent graphics card (GeForce GTX 1660 Ti).

When I open some files for editing, it sometimes becomes painful to edit them due to display glitches (see attached image). The cursor is sometimes badly placed, so that the insertion of text does not occur in the expected place. When we go to the end of the line, a margin sometimes appears at the end of the line, which makes it difficult to know if there are really spaces at the end of the line.

I tried uninstalling the app, along with all installed plugins, then reinstalling ... and even without plugins the problem still occurs.

Steps to Reproduce the Issue

1. Open a text file
2. Click on a line of text
3. Type text
4. The typed text is not inserted in the clicked location
5. Go to the end of the line
6. A ghost margin appears

Expected Behavior

• The typed text is inserted at the cursor position.
• The EOL is correctly displayed without ghost spaces.

Actual Behavior

• The typed text is sometimes inserted elsewhere in the current line.
• The EOL sometimes display extra spacing that isn't in the file.

Debug Information

Notepad++ v7.9.5 (64-bit)
Build time : Mar 21 2021 - 02:13:17
Path : C:\Program Files\Notepad++\notepad++.exe
Admin mode : OFF
Local Conf mode : OFF
OS Name : Windows 10 Pro (64-bit)
OS Version : 2009
OS Build : 19042.867
Current ANSI codepage : 1252
Plugins : mimeTools.dll NppConverter.dll NppExport.dll XMLTools.dll

See :

[grouillard]

Note that the issue happens with all previous versions I tested.

GR.

[mere-human]

@grouillard Can you try enabling this option and see if it makes any improvement?

[grouillard]

It solved the problem. Thanks.

Maybe this option should be enabled per default if there are no negative impacts on most workstations.

GR.