Give input a little flexibility so it can shrink on smaller tool bars
Improve and simplify transitions on (un)collapsing
allow to close the (expandable) calculator by using escape key
(PanelUI provides this functionality already out-of-the-box)
Improvements and enhancements to mouse support:
- History box can be opened with a middle click
- Elements in history can now be selected via mouse
- scicalc button/icon/closeIcon only react to left clicks (right click only triggers Firefox's native menu now)