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d47dc4b210
Usually a geometry generator expression must return a geometry in the associated layer's CRS. But this doesn't work in situations where a geometry generator symbol is NOT associated with a layer, e.g. when used in a layout item. So add a new option to allow users to specify which unit the expression will return geometries in, with choices of map units (the default, previous behavior), millimeters, pixels, inches and points. When millimeters, points, inches or pixels is selected then the @map_geometry variable will be available for the expression, and contain the feature's geometry in the specified units (relative to the map frame). (The $geometry variable remains available and still in layer CRS, in case an expression needs to calculate the original area, perimeter, etc in real-world units while returning results in a different unit!) A step toward fixing #39159