[BUG] No trimming for NO BREAK SPACE (UTF-8 C2A0)

Description of the Issue

This character isn't "recognized" by Notepad++, yet you can copy/delete it :

https://en.wikipedia.org/wiki/Non-breaking_space
https://www.fileformat.info/info/unicode/char/c2a0/index.htm
https://www.scivision.dev/hex-code-c2a0-non-breaking-space-markdown/

Steps to Reproduce the Issue

1. Enter the "no break space" \x{00A0} character into a UTF-8 file : Alt+0160 (Windows)
2. Try displaying the "spaces" (horizontal indentation)
3. Try trimming the "no break space"

Expected Behavior

1. "no break space" should be treated like any other "spaces" (horizontal indentation)

Actual Behavior

1. "no break space" is resilient to trimming, but can be edited/deleted manually

Debug Information

https://github.com/notepad-plus-plus/notepad-plus-plus/issues/5783

https://github.com/notepad-plus-plus/notepad-plus-plus/issues/6213

Regards

Start by reproducing the issue in a UTF-8 file: insert U+00A0, display spaces, and try trimming it. Compare the behavior with ordinary spaces and review the related issues #5783 and #6213; done means the non-breaking space is displayed and handled by trimming like other horizontal spaces.