A toolbar view, per its docs, expects its toolbar
children to either be of a set of known widget types that
are supported by default, or otherwise be a Gtk.Box-like
container with the .toolbar CSS style class.
This expectation was not met, but instead similar, but
not identical margins manually applied. These similar yet
different margins made it look off.
While this now adheres to the toolbar child requirements
of libadwaita, and the margins look more familiar, it
still breaks with libadwaita's assumption that toolbars
are not stacked. Its stylesheet allows for stacking
toolbar views only if one is providing the top and the
other the bottom one.
This view, especially, deserves a more thorough design
overhaul, regardless of this. Thus, I will leave it at
this.
Link: https://gnome.pages.gitlab.gnome.org/libadwaita/doc/main/class.ToolbarView.html
Signed-off-by: Markus Göllnitz <camelcasenick@bewares.it>
Part-of: <https://gitlab.gnome.org/GNOME/calls/-/merge_requests/791>
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