Fix:5346 【商城小程序】将商品加入购物车后，从购物车进入商品详情页后返回，原已选中的商品变为未选中状态

(cherry picked from commit 4fbb35ea0d)

pages/cart.vue

@@ -419,10 +419,12 @@ export default {
       },
       showAttr: false,
       pageKeyId: Object.freeze('landmarkGoodsIndex'),
+      cartSelectedIdsCacheKey: Object.freeze('cartSelectedIds'),
       isEdit: false,
       addressList:[],
       addressInfo: {},
       userLikeList: [],
+      selectedCartIds: [],
       // 是否已登录
       isNoLogin: false
     }
@@ -449,6 +451,7 @@ export default {
     }
   },
   created() {
+    this.selectedCartIds = this.getSelectedCartIds()
     this.getCart()
     this.getAddress()
   },
@@ -595,22 +598,75 @@ export default {
             isInvalid: true
           }
         })
-        this.list = res.data['valid'].concat(invalid)
-        this.handleAll(false)
+        this.list = this.restoreCartState(res.data['valid'].concat(invalid))
         const _res = await getUserLike()
         this.userLikeList = _res.data
       }
     },
-    handleAll(state) {
-      this.isAll = state
+    getSelectedCartIds() {
+      const ids = uni.getStorageSync(this.cartSelectedIdsCacheKey)
+      return Array.isArray(ids) ? ids : []
+    },
+    syncSelectedCartIds() {
+      const ids = []
+      this.list.forEach(item => {
+        item.carts.forEach(good => {
+          if (good.state) {
+            ids.push(good.id)
+          }
+        })
+      })
+      this.selectedCartIds = ids
+      uni.setStorageSync(this.cartSelectedIdsCacheKey, ids)
+    },
+    refreshSelectionState() {
+      let hasSelectableGoods = false
+      let isAll = true
       this.list = this.list.map(item => {
-        item.state = state
+        const selectableCarts = item.carts.filter(() => !item.isInvalid || this.isEdit)
+        if (selectableCarts.length > 0) {
+          hasSelectableGoods = true
+        }
+        item.state = selectableCarts.length > 0 && selectableCarts.every(good => good.state)
+        if (selectableCarts.length > 0 && !item.state) {
+          isAll = false
+        }
+        return item
+      })
+      this.isAll = hasSelectableGoods && isAll
+      this.syncSelectedCartIds()
+    },
+    restoreCartState(list) {
+      const selectedCartIds = new Set(this.selectedCartIds)
+      const nextList = list.map(item => {
+        const canSelect = !item.isInvalid || this.isEdit
+        const carts = item.carts.map(good => {
+          return {
+            ...good,
+            state: canSelect ? selectedCartIds.has(good.id) : false
+          }
+        })
+        return {
+          ...item,
+          carts,
+          state: false
+        }
+      })
+      this.list = nextList
+      this.refreshSelectionState()
+      return this.list
+    },
+    handleAll(state) {
+      this.list = this.list.map(item => {
+        const canSelect = !item.isInvalid || this.isEdit
+        item.state = canSelect ? state : false
         item.carts = item.carts.map(good => {
-          good.state = item.isInvalid && !this.isEdit ? false : state
+          good.state = canSelect ? state : false
           return good
         })
         return item
       })
+      this.refreshSelectionState()
     },
     navToStore(id) {
       if (id === 0) {
@@ -629,6 +685,7 @@ export default {
       if (mark.length === 1) {
         if (mark[0] === -1) {
           this.handleAll(state)
+          return
         } else {
           this.list[mark[0]]['state'] = state
           this.list[mark[0]]['carts'] = this.list[mark[0]]['carts'].map(good => {
@@ -648,13 +705,7 @@ export default {
         })
         this.list[mark[0]]['state'] = count === length
       }
-      let shopCheckNumber = 0
-      this.list.map(item => {
-        if (item.state) {
-          shopCheckNumber++
-        }
-      })
-      this.isAll = shopCheckNumber === this.list.length
+      this.refreshSelectionState()
     },
     inputChangeHandle(index, gIndex, good, e) {