Add configurable extent buffer to symbols (Request in QGIS)

[qgis-bot]

Request for documentation

From pull request qgis/QGIS#59630
Author: @JuhoErvasti
QGIS version: 3.42

Add configurable extent buffer to symbols

PR Description:

Fixes #38579.

Allows the user to set an extent buffer per symbol. Useful with for example geometry generator symbols:

2024-12-10.09-58-33.mp4

You can set the value in different units and it can also be controlled by an expression (for example you can set a different value based on the map scale).

When rendering QgsRenderer finds the biggest buffer value that has been set in all of its symbols. The extent for the feature request in QgsVectorLayerRenderer is then modified according to that value.

Backport to 3.40 requested (if possible).

Funded by the National Land Survey of Finland.

Commits tagged with [need-docs] or [FEATURE]