Description of problem:
Expanding the list of recent items causes X to freeze.

Version-Release number of selected component (if applicable):
2.29.1-4

How reproducible:
Every time (tried it three times).

Steps to Reproduce:
1. gnome-shell --replace
2. Activities Overlay
3. Click on arrow next to "Recent Items" to expand the list.
  
Actual results:
List will expand after a short delay.  However, you cannot close it again.  Mouse will move but nothing else is responsive.  Cannot escape Activies Overlay mode at all. I tried to just stop the gnome-shell with kill -9 but this did not work  so I had to kill X itself.

Expected results:
Recent items list should expand and collapse without locking up the system.

Additional info: