This patch extends our search to include our platform specific event
index.
There are 3 search scenarios and are handled differently when platform
support for indexing is present:
- Search a single non-encrypted room: Use the server-side search
like before.
- Search a single encrypted room: Search using our platform specific
event index.
- Search across all rooms: Search encrypted rooms using our local
event index. Search non-encrypted rooms using the classic
server-side search. Combine the results.
The combined search will result in having twice the amount of search
results since comparing the scores fairly wasn't deemed sensible.
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