Share retained preview pass sequence helper

docs/modernization/roadmap.md

@@ -3141,6 +3141,11 @@ Results:
   `execute_legacy_canvas_stroke_temporary_composite(...)` for setup, sampler
   bind, texture bind, draw, and texture unbind ordering, while erase-path and
   broader final composite ownership remain in the legacy Canvas path.
+- `NodeStrokePreview::draw_stroke_immediate()` now shares
+  `execute_legacy_node_stroke_preview_pass_sequence(...)` for
+  dual-pass/background/main-pass/final-composite/copy-back ordering, while the
+  remaining local preview ownership is concentrated around `stroke_draw_mix()`
+  setup/execution.
 - `NodeStrokePreview::stroke_draw_mix()` now shares one local helper for mixer
   framebuffer bind/unbind, viewport/scissor/blend state, texture-slot
   binding, and final plane draw, while material planning and shader uniform