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This patch changes the base cache directory to a new scheme containing
the qt version. At the time of commit, this would be
"QtLocation/5.8/tiles/"
This versioning does not have to change at every release, but when there
are changes in the caching scheme.
The reason for this is that, otherwise, it becomes difficult to clean
up old cache data.
QGeoFileTileCache::init already clean up old tile cache from 5.4 or
older, where the cache data wasn't organized under a directory for
each plugin.
In 5.8 different naming scheme are introduced for mapbox tiles
(with @1x,@2x) , here maps (with ppi), and soon for OSM too (with an
identifier for the actual provider, not only the mapId).
With this patch it will become easier and cleaner to upgrade the
cache data without leaving residues.
Change-Id: I89aeac0aaf1408d119cde5792fc69a64d5d89c3a
Reviewed-by: Alex Blasche <alexander.blasche@qt.io>
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