Mouse zooming not possible on Ubuntu 15.10
@jiritechet
Submitted by Jiří Techet Link to original bug (#758197)
Description
After trying libchamplain on Ubuntu 15.10 I realized that zooming with mouse is not possible any more. After investigating a bit it seems that inside scroll_event() the mouse wheel event is always CLUTTER_SCROLL_SMOOTH and not CLUTTER_SCROLL_UP/CLUTTER_SCROLL_DOWN any more. Moreover, the deltas from clutter_event_get_scroll_delta() are always 0.
This might be an issue of clutter 1.22.4 or clutter-gtk 1.6.2 shipped in Ubuntu 15.10 or caused by some backwards-incompatible change in clutter.