Fix DropdownInput widget not reactively updating when its content changes (#2770)

* Improve reactivity of DropdownInput.svelte

* Fix formatting lint

---------

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

Author: 0HyperCube

frontend/src/components/widgets/inputs/DropdownInput.svelte

@@ -30,6 +30,7 @@
 	let open = false;
 
 	$: watchSelectedIndex(selectedIndex);
+	$: watchEntries(entries);
 	$: watchActiveEntry(activeEntry);
 	$: watchOpen(open);
 
@@ -38,7 +39,13 @@
 	}
 
 	// Called only when `selectedIndex` is changed from outside this component
-	function watchSelectedIndex(_?: number) {
+	function watchSelectedIndex(_?: typeof selectedIndex) {
+		activeEntrySkipWatcher = true;
+		activeEntry = makeActiveEntry();
+	}
+
+	// Called only when `entries` is changed from outside this component
+	function watchEntries(_?: typeof entries) {
 		activeEntrySkipWatcher = true;
 		activeEntry = makeActiveEntry();
 	}

node-graph/gcore/src/raster/image.rs

@@ -291,7 +291,15 @@ pub fn migrate_image_frame<'de, D: serde::Deserializer<'de>>(deserializer: D) ->
 			*image_frame_table.instance_mut_iter().next().unwrap().alpha_blending = alpha_blending;
 			image_frame_table
 		}
-		FormatVersions::ImageFrame(image_frame) => RasterDataTable::new(Raster::new_cpu(image_frame.instance_ref_iter().next().unwrap().instance.image.clone())),
+		FormatVersions::ImageFrame(image_frame) => RasterDataTable::new(Raster::new_cpu(
+			image_frame
+				.instance_ref_iter()
+				.next()
+				.unwrap_or(Instances::new(ImageFrame::default()).instance_ref_iter().next().unwrap())
+				.instance
+				.image
+				.clone(),
+		)),
 		FormatVersions::ImageFrameTable(image_frame_table) => RasterDataTable::new(Raster::new_cpu(image_frame_table.instance_ref_iter().next().unwrap().instance.clone())),
 		FormatVersions::RasterDataTable(raster_data_table) => raster_data_table,
 	})