Isolate drawTreeArrows

frontend/components/TreeItem.vue

@@ -21,7 +21,7 @@ const start = ref(null)
 
 const arrows = []
 
-onMounted(() => {
+function drawTreeArrows() {
     if(start.value == null) return;
     for(let dest of treeItems.value) {
         console.log(dest)
@@ -46,6 +46,10 @@ onMounted(() => {
         })
         arrows.push(arrow)
     }
+}
+
+onMounted(() => {
+    drawTreeArrows()
 })
 onUnmounted(() => {
     for(let arrow of arrows) {