First off, I freaking LOVE YOU!!!
The convenience of having those toolbars contextually show / hide is
fantastic. However there is one minor inconsistency that needs
When you select a tool which has no sub-toolkit, could you have the
"Select" subtoolkit display, but be disabled. This would prevent the
panel from resizing, and throwing the document all over the place.
Alternatively, we could adjust the current location of the artboard
within the canvas window, by and inverse amount to the growth /
shrinkage of the panel ( but that seems entirely more complicated and
no more beneficial )