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this.index : this.item[this.vscrollData.keyField]\n    },\n\n    size () {\n      return (this.vscrollData.validSizes[this.id] && this.vscrollData.sizes[this.id]) || 0\n    },\n\n    finalActive () {\n      return this.active && this.vscrollData.active\n    },\n  },\n\n  watch: {\n    watchData: 'updateWatchData',\n\n    id () {\n      if (!this.size) {\n        this.onDataUpdate()\n      }\n    },\n\n    finalActive (value) {\n      if (!this.size) {\n        if (value) {\n          if (!this.vscrollParent.$_undefinedMap[this.id]) {\n            this.vscrollParent.$_undefinedSizes++\n            this.vscrollParent.$_undefinedMap[this.id] = true\n          }\n        } else {\n          if (this.vscrollParent.$_undefinedMap[this.id]) {\n            this.vscrollParent.$_undefinedSizes--\n            this.vscrollParent.$_undefinedMap[this.id] = false\n          }\n        }\n      }\n\n      if (this.vscrollResizeObserver) {\n        if (value) {\n          this.observeSize()\n        } else {\n          this.unobserveSize()\n        }\n      } else if (value && this.$_pendingVScrollUpdate === this.id) {\n        this.updateSize()\n      }\n    },\n  },\n\n  created () {\n    if (this.$isServer) return\n\n    this.$_forceNextVScrollUpdate = null\n    this.updateWatchData()\n\n    if (!this.vscrollResizeObserver) {\n      for (const k in this.sizeDependencies) {\n        this.$watch(() => this.sizeDependencies[k], this.onDataUpdate)\n      }\n\n      this.vscrollParent.$on('vscroll:update', this.onVscrollUpdate)\n      this.vscrollParent.$on('vscroll:update-size', this.onVscrollUpdateSize)\n    }\n  },\n\n  mounted () {\n    if (this.vscrollData.active) {\n      this.updateSize()\n      this.observeSize()\n    }\n  },\n\n  beforeDestroy () {\n    this.vscrollParent.$off('vscroll:update', this.onVscrollUpdate)\n    this.vscrollParent.$off('vscroll:update-size', this.onVscrollUpdateSize)\n    this.unobserveSize()\n  },\n\n  methods: {\n    updateSize () {\n      if (this.finalActive) {\n        if (this.$_pendingSizeUpdate !== this.id) {\n          this.$_pendingSizeUpdate = this.id\n          this.$_forceNextVScrollUpdate = null\n          this.$_pendingVScrollUpdate = null\n          this.computeSize(this.id)\n        }\n      } else {\n        this.$_forceNextVScrollUpdate = this.id\n      }\n    },\n\n    updateWatchData () {\n      if (this.watchData) {\n        this.$_watchData = this.$watch('data', () => {\n          this.onDataUpdate()\n        }, {\n          deep: true,\n        })\n      } else if (this.$_watchData) {\n        this.$_watchData()\n        this.$_watchData = null\n      }\n    },\n\n    onVscrollUpdate ({ force }) {\n      // If not active, sechedule a size update when it becomes active\n      if (!this.finalActive && force) {\n        this.$_pendingVScrollUpdate = this.id\n      }\n\n      if (this.$_forceNextVScrollUpdate === this.id || force || !this.size) {\n        this.updateSize()\n      }\n    },\n\n    onDataUpdate () {\n      this.updateSize()\n    },\n\n    computeSize (id) {\n      this.$nextTick(() => {\n        if (this.id === id) {\n          const width = this.$el.offsetWidth\n          const height = this.$el.offsetHeight\n          this.applySize(width, height)\n        }\n        this.$_pendingSizeUpdate = null\n      })\n    },\n\n    applySize (width, height) {\n      const size = Math.round(this.vscrollParent.direction === 'vertical' ? 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