Jimmy

> You are talking about themes but what you don't seems to realize is that there isn't any theming API, just CSS on GTK widgets I'm aware of that. It's...

It's a way to get back to a blank pdfslicer session, that is what you get when you open it from the appgrid, with no file loaded. Now that I...

> I do think that this action should have a corresponding UI-related button or something. Maybe a "Close current session" entry in the hamburguer menu? I remember I saw an...

Found it! I saw that "Close" and "Quit" in poedit. Its UI doesn't use the gtkheaderbar and the current gnome way of getting rid of the File/Edit/View/etc menu. That's why...

Uhm... I can't help with that. :( My skills in Glade are just some drag&drop. I hope you will find an easy and simple solution without putting too much effort....

I still struggle to understand how can you dev-guys "write" the UI...

How did you learn that? Do you have some book to suggest or some set of video-lessons?

I can't use python. I know only c++. :\ The best would be some very basic example using c++ and glade ui, I guess.

> You know Slicer is programmed in C++ right? Yes. I opened the main.cpp file and that's it. But I recognized c++ in there. My main concern is about how...

Well... A compromise of both. I noticed that the dimensions of that preview window are quite significant even at the lowest zoom. I'd suggest to try to replicate what the...