Refactorings & Fixes
- refactor(drag-handler): allow multiselection with ctrl #2203 (aae2023)
- refactor(zoomActivationKeyCode): accept null, cleanup types closes #2211 (7cddc81)
- style(handles): put position in default styles closes #2193 (d6de9c2)
- fix(selection): only calculate selection box if selected nodes > 0 (e03d6c2)