docs(pro:search): add merge items demo

packages/pro/search/demo/MergeItems.md

@@ -0,0 +1,14 @@
+---
+order: 22
+title:
+  zh: 合并同类选项
+  en: Merge items
+---
+
+## zh
+
+合并同类选项并置于尾部。
+
+## en
+
+Merge items of same key then place it at the end of all items.

packages/pro/search/demo/MergeItems.vue

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+<template>
+  <IxProSearch
+    :value="value"
+    style="width: 100%"
+    :searchFields="searchFields"
+    :onSearch="onSearch"
+    :onUpdate:value="handleValueUpdate"
+  ></IxProSearch>
+</template>
+
+<script setup lang="ts">
+import type { SearchField, SearchValue } from '@idux/pro/search'
+
+import { reactive, ref } from 'vue'
+
+const value = ref<SearchValue[]>([
+  {
+    key: 'level',
+    name: 'Level',
+    operator: '=',
+    value: 'level1',
+  },
+  {
+    key: 'keyword',
+    name: '',
+    value: 'custom keyword',
+  },
+])
+const securityStateField = reactive<SearchField>({
+  type: 'select',
+  label: 'Security State',
+  key: 'security_state',
+  multiple: true,
+  fieldConfig: {
+    multiple: true,
+    searchable: true,
+    dataSource: [
+      {
+        key: 'fatal',
+        label: 'fatal',
+      },
+      {
+        key: 'high',
+        label: 'high',
+      },
+      {
+        key: 'mediumn',
+        label: 'mediumn',
+      },
+      {
+        key: 'low',
+        label: 'low',
+      },
+    ],
+  },
+})
+const searchFields: SearchField[] = reactive([
+  {
+    key: 'keyword',
+    type: 'input',
+    label: 'Keyword',
+    multiple: true,
+    fieldConfig: {
+      trim: true,
+    },
+  },
+  {
+    type: 'select',
+    label: 'Level',
+    key: 'level',
+    operators: ['=', '!='],
+    defaultOperator: '=',
+    fieldConfig: {
+      multiple: false,
+      searchable: true,
+      dataSource: [
+        {
+          key: 'level1',
+          label: 'Level 1',
+        },
+        {
+          key: 'level2',
+          label: 'Level 2',
+        },
+        {
+          key: 'level3',
+          label: 'Level 3',
+        },
+      ],
+    },
+  },
+  securityStateField,
+])
+
+const handleValueUpdate = (searchValues: SearchValue[] | undefined) => {
+  const securityStateValues = searchValues?.filter(v => v.key === 'security_state') as
+    | SearchValue<string[]>[]
+    | undefined
+
+  if (!securityStateValues?.length) {
+    value.value = searchValues ?? []
+    return
+  }
+
+  const currentValue = securityStateValues.pop()!
+  value.value = [...searchValues!.filter(v => v.key !== 'security_state'), currentValue]
+
+  securityStateField.defaultValue = currentValue.value
+}
+const onSearch = () => {
+  console.log('onSearch')
+}
+</script>
+
+<style scoped lang="less"></style>