This is reproducible on demo-author
Steps to reproduce:
- Open link
- Reload with cache refresh (ctrl+f5 or on mac cmd+shift+r)
- Minimize Actionbar
now as a result there is a white space where the actionbar has been
Columns' width is adapted correctly when the action bar is minimized.
Maximize + Minimize again -> page is displayed correctly again. It only happens the first time the actionbar is minimized.