Yelp freezes while searching the offline Tails documentation

When using the search feature of the offline documentation, the pointer disappear from the screen and the offline doc seems to be freezing for a few seconds.

The pointer shouldn’t be disappearing, at least in order to allow user to do something else.

Parent Task: #7409 (closed)

Related issues

Related to #14962 (closed)
Related to #6569 (closed)

Original created by @mercedes508 on 6570 (Redmine)

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