The highlight feature by default overrides other colour schemes and
may in the process partially or fully obscure that an item has already
been output (or is scheduled for output using the multiselect patch).
In this context the highlighting does not add any valuable information
given that the user has already selected the item. Overall it seems
more user-friendly to skip drawing highlights for outputted items.
This patch is simpler than, and superior to, the TSV patch and as
such takes precedence if both are combined.
Also addressed some compatibility issues and compilation errors.
