Previously only a "layer clipping extent" was available for retrieval
from a QgsRenderContext instance, yet there's a need for rendering
operations to have access to the original full extent of the map
being rendered.
Because certain aggregates and concatenation requires results in
a certain order, this change allows specific control of the order
features are added to the aggregate during an expression evaluation.
E.g.
concatenate("Station",concatenator:=',', order_by:="Station")
will give a comma separated list of station names in alphabetical
order, rather than layer feature order.
Sponsored by SMEC/SJ
Previously, annotation size and position always used pixel units. This
did not work well when exporting layouts, resulting in tiny annotations
(it also caused issues when moving projects between hidpi/non hidpi
displays).
Instead, use millimeters for annotation size and position so that the
appearance is consistent across displays and works correctly in layout
exports.
Add lots of unit tests covering this.
Fixes#18373
base_file_name: Returns the base name of the file without the directory or file suffix.
file_exists: Returns true if a file exists
file_name: Returns the file name from a full path
file_path: Returns the directory/path from a full file path
file_size: Returns a file size
file_suffix: Returns a files suffix/extension
is_directory: Returns true if a file path is a directory
is_file: Returns true if a file path is a file
This provider option was linked to the project level option
"Trust layer metadata..." which was implemented
to speed up loading of large dataset by trusting extent
read from metadata to avoid costly operations to determine
the layer extent.
Check PK unicity on the other hand has only effect on views
and query layers and it is useful as an independent
option to prevent loading of layers that have no PK (or the
wrong one).
But the operation of determine unicity of a values in a column
can also be costly, so better to get control back to the user.
Legacy default is preserved (the project-level "Trust..." option).
Fixes#21839
Funded by RAAB.nl
