the text hightlighting feature was implemented backed on to the vcl
TextFillColor feature. TextFillColor fills the background of the bounds
of the text with that color

Likely either the same problem or similar as tdf#93789

Change-Id: Iace62cedc49e5f5844ac35d3caa23249b6cb4bc1
Reviewed-on: https://gerrit.libreoffice.org/55629Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>