densityFactor property
Density factor for elevation physics (Skia/Web only).
Range: 0.0 (normal) to 1.0 (fully elevated)
When a parent container provides blur (batch-blur optimization), elevated buttons use this to simulate the "double-darkening" effect of nested BackdropFilters without the O(n) performance cost.
On Impeller, this is not needed as each widget can have its own blur.
Defaults to 0.0.
Implementation
final double densityFactor;