Search feature does too much of magic

[kelson42]

Current search is a mix of a fulltext search and suggestions. To allow proper merging of results, the swift code does a bit of magic and heuristics.

This leads to:

• Complexity in the code
• Slower computations
• Discrepencies with other readers

This is not how it should work.

The Kiwix reader should reuse straight the results provided by the libzim.

Here are two proposals to change the behaviour to be more conform:

• Make a suggestion search per default (like in Kiwix Desktop of Kiwix Android) ie. while user is typing propose titles matching the search pattern. Provide an optional fulltext search if user can/wants (with result snippets)
• Make a suggestion search per default (like in Kiwix Desktop of Kiwix Android) ie. while user is typing propose titles matching the search pattern... and last item of the suggestion list allow to trigger a fulltext search (this is how works Kiwix Desktop)

FYI, Kiwix Android does not provide yet fulltext search feature.