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Michael Natterer authored
and use it to set visibility of guides and sample points, so this reression is fixed. - return NULL extents for invisible items and never draw them - do nothing for invisible items in more places, like the group While hacking this, it turned out that it was a braino to collect an item's region before and after a change in dispatch_properties_changed(), so a new update had to be devised: - add a "change count" and new API begin_change()/end_change() - in begin_change(), remember the item's extents before the change - in end_change(), combine old and current extents and emit "update" - add some protected function to emit "update", and to figure if it makes sense at all to emit "update" on an item.
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