fill-pattern and fill-extrusion-pattern size properties

Motivation

We would like to create a fill-extrusion-pattern which does not scale with zoom/stays at a fixed size. E.g. to create a 'bricked wall' effect on a building. Currently the fill pattern size will change at each zoom level. We could achieve this if there was a size property for the icon and if this could be used with expressions.

Design Alternatives

There's no alternative/workaround to this...except perhaps to use the custom layer interface.

Design

Adding fill-extrusion-pattern-size and fill-pattern-size with expression options should allow us to control the icon size by zoom level. An alternative might be a new property such as 'scale-pattern-with-zoom' which could be true or false.

Mock-Up

This would allow users to control the size of the fill pattern and potential make it a fixed size which does not scale with zoom levels.

Start by locating the implementations and property definitions for fill-pattern and fill-extrusion-pattern, then trace how their sizes respond to zoom and expressions. Done means both proposed size properties support expression-driven sizing, including a fixed-size pattern that does not change across zoom levels.