Route final texture setup sites through helper

docs/modernization/roadmap.md

@@ -3051,6 +3051,10 @@ Results:
   share the retained draw-merge texture shader setup helper for `Texture`,
   `Tex`, and `MVP` setup. Texture/sampler binding, viewport/state setup, and
   draw execution remain in the node paths.
+- `NodeCanvas` density-resolve drawing and desktop VR UI drawing now share the
+  retained draw-merge texture shader setup helper, while render target,
+  sampler/texture binding, viewport/state restoration, and draw execution
+  remain in retained node/VR code.
 - `CanvasModeTransform::on_Draw` and `CanvasModeFloodFill::on_Draw` now share
   the retained draw-merge texture shader setup helper for `Texture`, `Tex`, and
   `MVP` setup. Active texture selection, sampler/texture binding, and draw