Pretty confident in my solve. The only ones I didn’t get myself were 20-down, 29-down (obvious in retrospect), and 21-across (inferred the word, but didn’t know the tool).

        N I X O S
        O     P   K     C P
G T K   O     E M A C S   R
N   D E B I A N   L   C L I
O N E     T   S   I   R   N
M         H   U     M I N T
E D I T O R   S       P     H
  O       E L E M E N T A R Y
  N U C L E I     A   I     P
L G     S   N     G E N D E R
  L S       U     L   G     L
  E         X F C E         A
L S       P     E   L       N
S       Z O R I N O S     C D
          P     T

It’s not on the border. The specturm line is under each trait. Though it’s absolutely ridiculous that they’re connected instead of being bars.

They’re talking about the desktop application.

I couldn’t find a feature there either.

Maybe it’s a reference to the phenomenon when a word repeated that way isn’t noticed, or an earlier meme that uses it?