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Follow-up:

I found a simple way, to implement a transparent background that is automatically inherited to an svg export.
qet 0.90: qetdiagrameditor.cpp: 361-362

// Diagram::background_color = checked ? Qt::darkGray : Qt::white;
Diagram::background_color = checked ? Qt::transparent : Qt::white;

I just commented the original line 361 out and replaced "Qt::darkGray" by "Qt::transparent" in line 362. Now, when I use the new white/gray background toggle button on a folio and select the gray backgound, I get a transparent background.

Nice
Tom

P.S.: Here is an example.

Hi Laurent,

to be honest, I did not check the nightly 0.100 version. You see, I was curious about the 0.100 version, but did not want to compile it on a regular basis, so I installed the ppa and upgraded qet from 0.80 to 0.100. I spent some time playing with the 0.100 version and got the feeling that the 0.100 is too much "work in progress" for me. So I rolled back to 0.80 and as a compromise downloaded and installed the source of 0.90.

Anyhow, your screenshots show me that you are already aware of that issue and have it addressed. Excellent. I am looking forward to the release of 0.100.

Regards
Tom

@plc-user and scorpio810

Thanks for your quick reply.
Yes #1, it is not an issue but just a nice-to-have. And I can manually or assisted by a script remove the background color, if needed.
Yes #2, I already tried to modify the background color of the folio in the source code of 0.90. However, it turned out to be not as simple as replacing it by Qt::transparent :-). Unfortunately, I am neither very experienced in c++ nor in Qt.
Yes #3, I am running Linux Mint Mate 21.3 and are familiar with scripts and advanced editors as e.g. kate. However, for such small modifications I still prefer vim :-).

Good night
Tom