Transition gradients from bbox-relative to document-absolute space (#4241)

* Use userSpaceOnUse to render gradient on SVG

* Allow non-uniform transform to radial gradient on vello

* Position gradients absolutely instead of by bbox

* Fix SVG import by removing multiplication of bound's inverse transform

* Represent sheared linear gradients via their equivalent gradient line

* Migration

* Fix migration for radial (elliptical) gradients

* Fix boolean operation gradients

---------

Co-authored-by: Keavon Chambers <keavon@keavon.com>

editor/src/node_graph_executor.rs

@@ -458,6 +458,11 @@ impl NodeGraphExecutor {
 			first_element_source_id,
 		});
 		responses.add(DocumentMessage::UpdateClickTargets { click_targets });
+
+		// TODO: Eventually remove this document upgrade code
+		// Runs after click targets land (this graph run's geometry bounds) so the deferred gradient migration can use them.
+		responses.add(DocumentMessage::MigrateLegacyGradients);
+
 		responses.add(DocumentMessage::UpdateOutlines { outlines });
 		responses.add(DocumentMessage::UpdateTextFrames { text_frames });
 		responses.add(DocumentMessage::UpdateClipTargets { clip_targets });