Multicolorpolyline 260721#2235
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Introduce MulticolorPolyline with per-vertex colors, border handling, and tests. Skip simplification and segmentation for multicolor polylines so gradients stay intact.
Allow MulticolorPolyline to omit vertexColors and render a uniform fallback color. Resolve effective colors lazily so transparent vertex handling and render hashes stay correct.
Avoid a LateInitializationError in the polyline painter when a line is rendered without a border stroke.
Restore stroke-aware viewport culling, calculate meter widths once, expose only supported stroke options, and keep multicolor equality and hashing stable.
Track source indices through projected fragments so aggressive culling preserves per-vertex colors, and skip residual off-screen segment draw calls.
Interpolate vertex colors through joins, preserve cap behavior, and avoid opacity accumulation for transparent routes.
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