Tweaks to marks and matches cache

[variar]

Consider merging some tweaks from @gin-ahirsch's fork https://github.com/gin-ahirsch/glogg

• gin-ahirsch@534fc4c
• gin-ahirsch@5ad3b28

[gin-ahirsch]

Note that the commit have been updated. It's best to follow this branch: https://github.com/gin-ahirsch/glogg/commits/eager-filtered-items-cache.

[gin-ahirsch]

I have started porting my changes to klogg.
I have one issue at the moment: https://github.com/gin-ahirsch/glogg/blob/4ac06ca0d198b0773f2ad81beace333d9695df02/src/logdata/src/logfiltereddata.cpp#L359
I've changed LogFilteredDataWorkerThread::getSearchResult() to LogFilteredDataWorkerThread::updateSearchResult(), which instead of copying the whole array only appends the missing elements. Since in glogg the array is updated linearily this is trivial. I assume that the multi-threaded search feature of klogg means that the updates can also happen out of order, so obviously that breaks.
I want to try and change LogFilteredDataWorkerThread to not sort the array at all and just append to the end, so LogFilteredData can do the sorting in its place, which will allow the update and indexing for the eager filteredItemsCache_ to work as I intended.

It's possible that I don't get the time to work on this until mid-April, so I wanted to drop this note here.

[gin-ahirsch]

The port is now complete and functional at https://github.com/gin-ahirsch/glogg/tree/eager-filtered-items-cache-klogg. I'll open a PR once #67 is merged, since the branch builds on those changes.