[4.2] Smart Search: Allow fuzzy word matching

[Hackwar]

Summary of Changes

A regular request was to be able to also find compoung words. Smart Search right now matches the words exactly, even though it uses a stemmer to find common roots for a word. However those stemmers can only work on single words and "fail" on compound words, like they are very common in for example the german language. This PR allows to switch the matching method between exact matches, matching words starting with the given term and matching words which just contain the term in a random position. I was hoping that there would be a way to automatically split compound words in their different parts and to also index those, however I couldn't find a solution which could be used with justifiable effort. So this is the next best solution as it seems.

Testing Instructions

1. Apply this PR to your Joomla installation.
2. Go to the configuration of Smart Search and set the "Word Match" to your prefered setting.
3. Test searching in the frontend with parts of compound words. No reindexing needed.

Notes

1. Since 4.1 is in RC, this will have to go into 4.2. Since there is no 4.2-dev branch yet, I'm pointing this towards 4.1-dev for now.

[HLeithner]

please don't introduce magic numbers, define "words" in the xml and add constants to the class for matching the value.

[superknutsel]

I have tested this item 🔴 unsuccessfully on 7e56d0b

I found that when searching for a partial or complete word the suggestion showed the result but after hitting enter there were no results show. When I revert the patch I get results for complete words when I do this, not for partial search terms.

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[Hackwar]

Thank you, @superknutsel. There was indeed a bug in the code. Can you test this again?

[superknutsel]

I have tested this item ✅ successfully on a1d1b4f

Hi @Hackwar I tested again and now it's working.

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[Hackwar]

Thank you very much.

[webnet-assmann]

I have tested this item ✅ successfully on a1d1b4f

Tested it with all settings of Word Match and it's working.
Thank you Hannes.

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[HLeithner]

Thanks