Notepad++ v8.1 Release Candidate
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Notepad++ v8.1 Release Candidate is available here:
http://download.notepad-plus-plus.org/repository/8.x/8.1.RC/v8.1 regression-fixes and improvements:
- Fix regression of auto-completion performance issue (Fix #9975)
 - Fix Open dialog with “Save” label for “Open” button (Fix #9966)
 - Fix Notepad++ crash on dark mode while starting up (Fix #9961)
 - Improve look & feel in dark mode (Fix #9982)
 - Adapt Tooltips in dark mode (Fix #9962)
 - Remove white line under menubar in dark mode (Fix #9984)
 
The release will be out in a few days if there’s no critical bug found.
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Commit “Fix Notepad++ crash on dark mode while starting up” introduced a bug in displaying plugin toolbar icons in dark mode - the icons are not visible, they are replaced by a black placeholder icon.
I updated one of my plugins to support new message
NPPM_ADDTOOLBARICON_FORDARKMODE. It works with Npp v8.0 and with all AppVeyor builds prior to the one mentioned above. - 
@dinkumoil
Thank you for your report.
It’s fixed in RC2:
https://community.notepad-plus-plus.org/topic/21337/notepad-v8-1-release-candidate-2