Matrix layout vertical : is it possible to keep the first child on top, while scrolling the others?

Community Usage questions
1

org

Everything is said... is there a way to keep the first child, here the "folder button", not moving, while scrolling the other buttons in the matrix (here, the instruments) ?

I know that i can just use a button widget to show up the matrix of instruments, but... here am i... dealing with matrix... So... Any clue for this ?

Thanks

2

Here be dragons (this is a hack, no guarantee it will work forever):

.widget:first-child{
  position:sticky!important;
  top:0!important;
  z-index:1;
  background:var(--color-background);
}
3

Gosh... that's cool... Hope it will last for a while !

Thank you !