Port to breeze style?
The current decoration looks out of place on plasma and results in different window borders between qt and gtk csd.
Wouldn't it make more sense to port it to the breeze style, or is that style too complex?
Gtk apps have headerbars so they won't be exactly the same, but it looks close enough for me. Recent versions of Plasma will paint the material close buttons as svgs for the GTK theme.

If you really want the breeze icon style just edit the icons drawn in Material to use the logic from Breeze:
- https://invent.kde.org/plasma/breeze/-/blob/master/kdecoration/breezebutton.cpp#L159
Or fork SierraBreeze or SierraBreezeEnhanced and add the AppMenu+TextButton code to it (eg: call it BreezeLIM).
- https://zren.github.io/2017/07/08/patching-breeze-window-decorations
- https://github.com/ishovkun/SierraBreeze/blob/master/breezebutton.cpp#L162
Sorry for my ignorance, but how do you patch it? I would like to keep the style of Breeze, but I don't know how to make the modification for the LIM