Attempt to fix memory leak when side scrolling or skipping at same zoom level #5283
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Possible fix for #4844
The layout does not get 'cleaned up' as long as you stay at the same zoom level, and now feature data is stored in the layout which increases it's size
Needs to be tested still but several automated tests were created that pass
It is also possible that there may be multiple memory leaks also with this only being one of them...memory leaks are tricky business compared to most simple debugging tasks so will need investigation