@halirutan What's meaning of the away in J. M. is away?

Could you tell me something about the friend?

Or maybe I can help a little?

@yode My last information is that he could not afford to repair the screen of his laptop and cannot use the laptop of his friend anymore. But I don't know the details.

@yode He has more information in his math.SE profile, in which he writes that he is "on indefinite hiatus due to financial difficulties."

To whom it may concern: There might be a new Stack Exchange for "Operations Research" -- if more people commit to it: area51.stackexchange.com/proposals/121892/…

@Kuba it looks like Mathematica doesn't implement the OS-specific appearance correctly

On the other hand you can use any custom appearance without issue:

Button[
 "...",
 Appearance ->
  FEPrivate`FrontEndResource["NotebookTemplatingExpressions",
   "ButtonDefaultAppearance"],
 ContentPadding -> False,
 FrameMargins -> {{2, 2}, {-3, -4}}
 ]

@halirutan I'll take a look at this

@b3m2a1 Maybe this cannot be solved, but atm I can even round the coordinates in Mathematica and it looks perfect but after the SVG export there are several artifacts in the graphics.

I'll see what I can do in a bit. I have to do a slew of preprocessing and my base guess is that this is the issue.

@LukasLang both update for me on Mac v12.0. The logic is a bit wonky in terms of incrementing/decrementing but it certainly responds.

@Kuba looks like they broke that one too? I wasn't expecting there to be a special TabViewBox to be honest...

Looks like they don't respect Appearance appropriately there

And so the default Panel background never goes away

It is also seemingly difficult to reimplement as Panel is clearly layered after Button in the FE layout mechanism.

@b3m2a1 Hmm... that's strange - but thanks a lot for taking a look!