fix: reorder idx if grid row is reordered

(cherry picked from commit cd96171a4c1a784ffa2b00d28e2b22921b9c9f37)

frontend/src/components/Controls/Grid.vue

@@ -70,6 +70,7 @@
           :delay="isTouchScreenDevice() ? 200 : 0"
           group="rows"
           item-key="name"
+          @end="reorder"
         >
           <template #item="{ element: row, index }">
             <div
@@ -515,6 +516,13 @@ const deleteRows = () => {
   selectedRows.clear()
 }
 
+const reorder = () => {
+  rows.value.forEach((row, index) => {
+    row.idx = index + 1
+  })
+}
+
+
 function fieldChange(value, field, row) {
   triggerOnChange(field.fieldname, value, row)
 }