I opened a master project in RH 7. The master and all
subprojects were generated in RH X5 and RH 6.
I re-generated WebHelp for the master project, including the
new Search highlight option, and published to the merged project
master directory. I did not regenerate any subprojects in RH7.
Merged TOC is OK.
Merged Index is OK. A given index term finds stuff where it
should in the subprojects.
The Search function is OK. Search terms find everything in
Search highlight does not function. The checkbox does not
appear in the search pane at left, and there is no highlighting in
any of the found topics.
Tentative conclusion: Search highlighting does not work
unless the master and all sub-projects have been generated in RH 7
with the highlight option selected in all of them.
(Following up later:)
I added a subproject, which I generated in RH 7 with search
highlight selected and published into the merged projects. This
time the master search pane showed the checkbox. It found all
instances of the search term, but it was highlighted only in the
new project, as well as the master project.
The search highlight works in a master project if at least
one subproject is generated in RH 7, but only in the one(s) gen'ed
in RH 7.