Created attachment 105412 [details]
[PATCH] Do not instantiate cardwidget, devicewidget and rolewidget with a type of EventBox

RoleWidget::create contains:
    x->get_widget_derived("streamWidget", w);

But streamWidget is defined as following in the glade file:
<object class="GtkEventBox" id="streamWidget">

Where as RoleWidget is derived from [Minimal]StreamWidget, which is derived
from Gtk::VBox, so this is clearly wrong.

Adding:
printf("rolewidget type: %s\n", g_type_name(G_TYPE_FROM_INSTANCE(w->gobj())));
for debugging shows that this really leads to RoleWidget being instantiated
as an EventBox (yet things still work due to sheer luck).

This commit fixes this, by putting the streamWidget id at the right level of
the hierarchy in the glade file (and likewise for cardWidget and deviceWidget).