Choices are "individual features" (the default behavior) or "continuous
surface". The new Continuous Surface option is designed for vector
layers which represent a continuous elevation surface, e.g contour
lines or surveyed elevation points. When selected, the elevation
chart will be rendered as a surface instead of separate features
by joining the sampled elevation results into a continuous line.
There's also the same option exposed as for raster and mesh layers
where the appearance can be toggled from a single line to a "fill
below" symbol.
Fixes#48341
826cbe37d6