pub const DEFAULT_CLEAR: Color;Expand description
Fallback GPU clear color painted before the very first frame - what a
user sees for an instant during window creation, and behind any pixel
the app’s tree doesn’t cover. This is the single Rust-side source of
truth for that fallback; lumen_runtime::run::RunOptions::clear (the
value every launch path reaches - CLI, FFI, SDK) defaults to it too,
so the two never drift apart the way they used to.
A resolved --lumen-window-bg custom property (from the app’s own
:root or its active skin) overrides this at build time - see
lumen_runtime::run::app_build::build_app. This constant is only what
remains when no layer defines that token, or a caller constructs
WindowOptions directly without going through RunOptions at all.