Bug#857311: libreoffice-calc: unreadable text in cell

[Peter Nowee]

I have been seeing this problem since at least 1:5.2.3~rc1-4~bpo8+1 on 
Jessie. Still present in the current 1:5.2.7-1 on Stretch.

Removing libreoffice-gtk2 (thereby using libreoffice-gtk3) solves the 
problem for me.

Best regards,
Peter