This can be useful when embedding complex widgets like a file chooser as a page.
https://bugzilla.gnome.org/show_bug.cgi?id=750631
c3a0880 GtkAssistant: Add a way to have pages without padding
docs/reference/gtk/gtk3-sections.txt | 2 +
gtk/gtkassistant.c | 86 +++++++++++++++++++++++++++++++++-
gtk/gtkassistant.h | 8 ++++
3 files changed, 95 insertions(+), 1 deletion(-)
Upstream: git.gnome.org