Dynamically switching pullRight when closed leads to sidebar visually moving over

[pareis]

Environment

• Chrome lastest on Mac OS X 10.13

Steps to reproduce

1. Open the demo http://balloob.github.io/react-sidebar/example/
2. Click open to open the sidebar
3. Click on the overlay to close it
4. Click on pullRight checkbox

Expected Outcome

There is no visible effect resulting from the sidebar moving over

Actual Outcome

The sidebar will appear on the right and transition to close immediately

Comments

• As a result of this, it is impossible to switch the pullRight flag dynamically, because you will always see that it happens even though it immediately closes
• It is not required to do steps 1-3 of the above, because just toggling pullRight will result in visibility of the sidebar moving over

[markusenglund]

I'll gladly accept a PR for this if you want to commit the effort to do it.