When switching the exercise, the chooser tab should close automatically

[mquinson]

When you switch the exercise by openning a little tab on the left, that tab does not get automatically closed when you double-click an exercise to pick it. This forces the user to do a useless click out of that tab to close it.

This does not sound very intuitive to me, and rather easy to fix.

Thanks for your work,

[mquinson]

Also, as noted in #95, opening the chooser shifts the interface to the right, moving some buttons out of the window.