Im working on it- if i forget to implement it next days please remind me again. Got Luna window decorations working on cinnamon tenex wil follow soon and everything would be updated here. Cinnamon has changed the code for window decoration but dont worry itll be here soon.

Thanks!

now done, works well with y-dark-red or y-dark-aqua cinnamon theme so iwont create a true cinnamon theme but false metacity theme is now implemented

ON linux mint 21 it works now.

Thanks!