Created attachment 113100 [details]
A screenshot of the bug
LibreOffice 220.127.116.11 on Linux Mint 17.1 Cinnamon, 32-bit (tested on Master as well), two monitors, sidebar docked to the LEFT side of the screen, is set to styles and formatting and is open.
1. Open a document.
2. Open another document.
3. Return to the previous document.
The sidebar should display correctly
The sidebar controls slide back, leaving a clear grey area and making some buttons unreadable/unreachable, as seen in the attached image.
Additional note: this does not occur when the sidebar is docked to the right of the window (which it is by default).
*** This bug has been marked as a duplicate of bug 72007 ***