correct place
This fixes the rendering of vector tiles layers which are constructed
in any non web mercator CRS.
(Unfortunately the required information is not recorded in mbtiles
packages, so it's necessary to set the correct parameters via
API calls when trying to load non-3857 mbtiles.)
as "basemap" layers
This flag identifies if the layer is considered a 'basemap' layer, where
certain properties of the layer should be ignored when calculating
project-level properties. For instance, the extent of basemap layers
should be ignored when calculating the overall extent of a project,
as these layers are typically global and extend outside of a project's
area of interest.
The Mapbox Vector Tile specification provides these definition for projection and bounds.
A Vector Tile represents data based on a square extent within a projection. A Vector Tile SHOULD NOT contain information about its bounds and projection. The file format assumes that the decoder knows the bounds and projection of a Vector Tile before decoding it.
Web Mercator is the projection of reference, and the Google tile scheme is the tile extent convention of reference. Together, they provide a 1-to-1 relationship between a specific geographical area, at a specific level of detail, and a path such as https://example.com/17/65535/43602.mvt.
Vector Tiles MAY be used to represent data with any projection and tile extent scheme.
It is possible to encode and write vector tiles in different CRS than EPSG:3857.
The implementation used the CRS bounds to defined the tile 0 top left coordinates and the scale denominator for 0 zoom level.
Instead of ALWAYS converting all features in a tile to QGIS representations,
now we intelligently skip over any layers which aren't required for
rendering or labeling (e.g. because the current renderer/labeling
configuration is disabling these layers or doesn't have a rule for
them).
This improves rendering speed with sources like the OS ZoomStack tiles,
which have a LOT of detail even at small map scales (e.g. building
data is present in very zoomed out tiles!!).
