Update the sidebar tab rearranger to use Drag and Drop (again)

module/utils/performArraySort.mjs

@@ -0,0 +1,31 @@
+export function performArraySort(
+	element,
+	{ list, targetIndex },
+) {
+
+	// Case: same position
+	if (list.indexOf(el => el === element) === targetIndex) {
+		return Array.from(list);
+	};
+
+	// Case: start of array
+	if (targetIndex === 0) {
+		list = list.filter(el => el !== element);
+		return [element, ...list];
+	};
+
+	// Case: end of array
+	if (targetIndex === list.length - 1) {
+		list = list.filter(el => el !== element);
+		return [...list, element];
+	};
+
+	// Case: middle of array
+	const front = list
+		.slice(0, targetIndex)
+		.filter(el => el !== element);
+	const back = list
+		.slice(targetIndex)
+		.filter(el => el !== element);
+	return [...front, element, ...back];
+};