Fix thumbnails not being updated for layers when they become empty (#3624)

* fix: thumbnail render for empty layers

* removed self import

* fix: rename

* Cleanup

---------

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

editor/src/node_graph_executor/runtime.rs

@@ -514,33 +514,36 @@ impl NodeRuntime {
 		}
 
 		let bounds = match graphic.bounding_box(DAffine2::IDENTITY, true) {
-			RenderBoundingBox::None => return,
+			RenderBoundingBox::None => None,
-			RenderBoundingBox::Infinite => [DVec2::ZERO, DVec2::new(300., 200.)],
+			RenderBoundingBox::Infinite => Some([DVec2::ZERO, DVec2::new(300., 200.)]),
-			RenderBoundingBox::Rectangle(bounds) => bounds,
+			RenderBoundingBox::Rectangle(bounds) => Some(bounds),
 		};
-		let footprint = Footprint {
+		let new_thumbnail_svg = if let Some(bounds) = bounds {
-			transform: DAffine2::from_translation(DVec2::new(bounds[0].x, bounds[0].y)),
+			let footprint = Footprint {
-			resolution: UVec2::new((bounds[1].x - bounds[0].x).abs() as u32, (bounds[1].y - bounds[0].y).abs() as u32),
+				transform: DAffine2::from_translation(DVec2::new(bounds[0].x, bounds[0].y)),
-			quality: RenderQuality::Full,
+				resolution: UVec2::new((bounds[1].x - bounds[0].x).abs() as u32, (bounds[1].y - bounds[0].y).abs() as u32),
+				quality: RenderQuality::Full,
+			};
+
+			// Render the thumbnail from a `Graphic` into an SVG string
+			let render_params = RenderParams {
+				footprint,
+				thumbnail: true,
+				..Default::default()
+			};
+			let mut render = SvgRender::new();
+			graphic.render_svg(&mut render, &render_params);
+
+			// And give the SVG a viewbox and outer <svg>...</svg> wrapper tag
+			render.format_svg(bounds[0], bounds[1]);
+
+			render.svg
+		} else {
+			Vec::new()
 		};
 
-		// Render the thumbnail from a `Graphic` into an SVG string
+		// Update frontend thumbnail
-		let render_params = RenderParams {
-			footprint,
-			thumbnail: true,
-			..Default::default()
-		};
-		let mut render = SvgRender::new();
-		graphic.render_svg(&mut render, &render_params);
-
-		// And give the SVG a viewbox and outer <svg>...</svg> wrapper tag
-		render.format_svg(bounds[0], bounds[1]);
-
-		// UPDATE FRONTEND THUMBNAIL
-
-		let new_thumbnail_svg = render.svg;
 		let old_thumbnail_svg = thumbnail_renders.entry(parent_network_node_id).or_default();
-
 		if old_thumbnail_svg != &new_thumbnail_svg {
 			responses.push_back(FrontendMessage::UpdateNodeThumbnail {
 				id: parent_network_node_id,