Seems that GtkImage/s or GtkPicture/s cannot show PNG images in an appropiate heigh / width sizes.
Firstly, I get a reference of GdkPixbuf doing
Gdk::Pixbuf::create_from_file (Glib::build_filename (DATADIR, "image.png"), 100, 100);
Making changes of last values from 100 to upper (like 500) or to lower values does not produce any effect on image sizes.
Is there a bug ?
I’m working on GTK4 (4.6.4) and GTKmm-4.0 (4.6.1).