These were getting created with possible non-zero values and then inserted
into a hashtable where the readers may not know the state of the group.
Ensure those values are set to zero until we assign them below.
if (!muxer->groups)
muxer->groups = g_hash_table_new_full (g_str_hash, g_str_equal, NULL, gtk_action_muxer_free_group);
- group = g_slice_new (Group);
+ group = g_slice_new0 (Group);
group->muxer = muxer;
group->group = g_object_ref (action_group);
group->prefix = g_strdup (prefix);