Fixes #3945 - Fixes two things: (1) there was faulty logic in
EventSelection.js (in there forever) in checks that decided whether to
update the dropdown menus next to event attributes (2) on Chrome, the
dropdown arrows were too close to the right edge of palette, which
caused mouse events to not work on the right half of the dropdown
control. Moved the control 5px to left and now no problem.
Merge branch 'master' of github.com:maqetta/maqetta