muffin: decoration icons come from icon theme instead of gtk theme

[biki28]

Window control buttons are inconsistent with some icon themes which are installed by default namely numix, papirus. This issue is from mint 21.
here is the reference of the same issue in mint 21.1 beta
linuxmint/mint21.1-beta#78

[SebastJava]

@johnsonmt01 had previously suggested a possible solution to this on my Mint-Yz-theme fork from Mint-Y:

I've noticed that with mint-y-legacy, and the older mint-yz themes based on them, the window controls are consistent across Metacity/GTK, regardless of icon theme. This appears to be caused by a reference in gtk.css to an "assets" folder stored alongside gtk.css, which stores the window control icons. This reference drives the consistency.

Presumably, it would be possible in current mint-yz themes to remove the gtk.css reference and dependency on Mint-Y icons, and replace that with an "assets" folder ensuring consistent window controls. Unless users prefer the variety, of course.

ref: SebastJava/mint-yz-theme#55 (comment)

Sorry, i still haven't tried this, i haven't done anything in that repository since Oct 12, 2022.

[johnsonmt01]

This may be of interest; I did some work recently related to modifying window controls.
https://forums.linuxmint.com/viewtopic.php?t=398557

[clefebvre]

Re-added to roadmap for 21.3.