fix: move onchange call right before inspect effects

Author: paoloricciuti

packages/svelte/src/internal/client/reactivity/sources.js

@@ -238,15 +238,6 @@ export function internal_set(source, value) {
 		source.v = value;
 		source.wv = increment_write_version();
 
-		var onchange = source.o?.onchange;
-		if (onchange) {
-			if (onchange_batch) {
-				onchange_batch.add(onchange);
-			} else {
-				onchange();
-			}
-		}
-
 		if (DEV && tracing_mode_flag) {
 			source.updated = get_stack('UpdatedAt');
 			if (active_effect != null) {
@@ -274,6 +265,15 @@ export function internal_set(source, value) {
 			}
 		}
 
+		var onchange = source.o?.onchange;
+		if (onchange) {
+			if (onchange_batch) {
+				onchange_batch.add(onchange);
+			} else {
+				onchange();
+			}
+		}
+
 		if (DEV && inspect_effects.size > 0) {
 			const inspects = Array.from(inspect_effects);
 			var previously_flushing_effect = is_flushing_effect;