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I should be great to have that feature inside the bottom search bar (just like firefox).
And also remember its state: remember if the user prefer to highligth matches or not

The search box in the preview panel already does this. Why do we need it twice?

which is the preview panel you are referring to?
in okular, i only see as panels: content, thumbnails, reviews and bookmarks

Thumbnails is the one I mean.

I see, that works fine, but then why having 2 different search boxes (that one and the one that appears when pressing Ctrl+F)?

Probably there is people like me that dont see the second one; so why not put that feature in the normal one (Ctrl+F)?
as we already have the code, it should be easy, right?

It's a bit confusing I guess, but one is a filter (the one on the thumbnails), while the other is a 'find' (the ctrl+F).

You are right though, the functionality of those two is very similar. Why not combine them. That's what Kate does (the 'find' behaves both as a find, by highlighting the first/current occurrence, and filter, by using a lighter highlight for all other occurrences).

I never use the search bar myself, I always use the thumbnail panel. I didn't even know it was there until I accidentally president Ctrl+F once out of habit. It provides no additional functionality.