Instance tables refactor part 5: unwrap GraphicGroup as multi-row Instance<GraphicElement> tables and move up transforms (#2363)

* Just group

* Partly working but without transforms

* Remove Transform/TransformMut from GraphicElement and GraphicGroupTable

* Fix layers and flattening

* Fix transform group handling on the remaining nodes

* Change collect metadata

* Add transform on vector data. TODO: Remove duplicate transform

* Small code tidying-up

* Add concatenate node?

* Remove ignore_modifications which is always false

* Improve transforms

* Mostly fix the nested transform cage angle (except leaf layers and skew)

* WIP attempt to integrate skew

* Fix nesting bounding box

* Avoid setting the transform

* Fix stroke transforms

* Renderer cleanup

* Fix tests for repeated elements not given unique point IDs

* Suppress cargo-deny warning

* Fix upgrade code for graphic group data

* Work around rendering issue in Isometric Fountain

---------

Co-authored-by: Adam <adamgerhant@gmail.com>
Co-authored-by: hypercube <0hypercube@gmail.com>

node-graph/gcore/src/raster.rs

@@ -335,6 +335,7 @@ fn blend_mode<T: SetBlendMode>(
 	mut value: T,
 	blend_mode: BlendMode,
 ) -> T {
+	// TODO: Find a way to make this apply once to the table's parent (i.e. its row in its parent table or Instance<T>) rather than applying to each row in its own table, which produces the undesired result
 	value.set_blend_mode(blend_mode);
 	value
 }
@@ -350,7 +351,7 @@ fn opacity<T: MultiplyAlpha>(
 	mut value: T,
 	#[default(100.)] factor: Percentage,
 ) -> T {
-	let opacity_multiplier = factor / 100.;
-	value.multiply_alpha(opacity_multiplier);
+	// TODO: Find a way to make this apply once to the table's parent (i.e. its row in its parent table or Instance<T>) rather than applying to each row in its own table, which produces the undesired result
+	value.multiply_alpha(factor / 100.);
 	value
 }