fix: select title error #588

Author: tangjinzhou

Diff for: components/form/__tests__/__snapshots__/demo.test.js.snap

@@ -404,9 +404,7 @@ exports[`renders ./components/form/demo/register.vue correctly 1`] = `
   <div class="ant-row ant-form-item">
     <div class="ant-col-xs-24 ant-col-sm-8 ant-form-item-label"><label for="phone" title="Phone Number" class="ant-form-item-required">Phone Number</label></div>
     <div class="ant-col-xs-24 ant-col-sm-16 ant-form-item-control-wrapper">
-      <div class="ant-form-item-control"><span class="ant-form-item-children"><span class="ant-input-group-wrapper" style="width: 100%;"><span class="ant-input-wrapper ant-input-group"><span class="ant-input-group-addon"><div class="ant-select ant-select-enabled" style="width: 70px;" data-__meta="[object Object]" data-__field="[object Object]" id="prefix"><div role="combobox" aria-autocomplete="list" aria-haspopup="true" aria-controls="test-uuid" tabindex="0" class="ant-select-selection ant-select-selection--single"><div class="ant-select-selection__rendered"><div title="
-          +86
-        " class="ant-select-selection-selected-value" style="display: block; opacity: 1;">
+      <div class="ant-form-item-control"><span class="ant-form-item-children"><span class="ant-input-group-wrapper" style="width: 100%;"><span class="ant-input-wrapper ant-input-group"><span class="ant-input-group-addon"><div class="ant-select ant-select-enabled" style="width: 70px;" data-__meta="[object Object]" data-__field="[object Object]" id="prefix"><div role="combobox" aria-autocomplete="list" aria-haspopup="true" aria-controls="test-uuid" tabindex="0" class="ant-select-selection ant-select-selection--single"><div class="ant-select-selection__rendered"><div title="+86" class="ant-select-selection-selected-value" style="display: block; opacity: 1;">
           +86
         </div></div><span unselectable="on" class="ant-select-arrow" style="user-select: none;"><i class="ant-select-arrow-icon anticon anticon-down"><svg viewBox="64 64 896 896" data-icon="down" width="1em" height="1em" fill="currentColor" aria-hidden="true" class=""><path d="M884 256h-75c-5.1 0-9.9 2.5-12.9 6.6L512 654.2 227.9 262.6c-3-4.1-7.8-6.6-12.9-6.6h-75c-6.5 0-10.3 7.4-6.5 12.7l352.6 486.1c12.8 17.6 39 17.6 51.7 0l352.6-486.1c3.9-5.3.1-12.7-6.4-12.7z"></path></svg></i></span></div>
     </div></span><input type="text" data-__meta="[object Object]" data-__field="[object Object]" id="phone" class="ant-input"></span></span></span>
@@ -742,9 +740,7 @@ exports[`renders ./components/form/demo/validate-static.vue correctly 1`] = `
   <div class="ant-row ant-form-item">
     <div class="ant-col-xs-24 ant-col-sm-5 ant-form-item-label"><label title="Error" class="">Error</label></div>
     <div class="ant-col-xs-24 ant-col-sm-12 ant-form-item-control-wrapper">
-      <div class="ant-form-item-control has-feedback has-error"><span class="ant-form-item-children"><div class="ant-select ant-select-enabled"><div role="combobox" aria-autocomplete="list" aria-haspopup="true" aria-controls="test-uuid" tabindex="0" class="ant-select-selection ant-select-selection--single"><div class="ant-select-selection__rendered"><div title="
-        Option 1
-      " class="ant-select-selection-selected-value" style="display: block; opacity: 1;">
+      <div class="ant-form-item-control has-feedback has-error"><span class="ant-form-item-children"><div class="ant-select ant-select-enabled"><div role="combobox" aria-autocomplete="list" aria-haspopup="true" aria-controls="test-uuid" tabindex="0" class="ant-select-selection ant-select-selection--single"><div class="ant-select-selection__rendered"><div title="Option 1" class="ant-select-selection-selected-value" style="display: block; opacity: 1;">
         Option 1
       </div></div><span unselectable="on" class="ant-select-arrow" style="user-select: none;"><i class="ant-select-arrow-icon anticon anticon-down"><svg viewBox="64 64 896 896" data-icon="down" width="1em" height="1em" fill="currentColor" aria-hidden="true" class=""><path d="M884 256h-75c-5.1 0-9.9 2.5-12.9 6.6L512 654.2 227.9 262.6c-3-4.1-7.8-6.6-12.9-6.6h-75c-6.5 0-10.3 7.4-6.5 12.7l352.6 486.1c12.8 17.6 39 17.6 51.7 0l352.6-486.1c3.9-5.3.1-12.7-6.4-12.7z"></path></svg></i></span></div>
     </div><span class="ant-form-item-children-icon"><i class="anticon anticon-close-circle"><svg viewBox="64 64 896 896" data-icon="close-circle" width="1em" height="1em" fill="currentColor" aria-hidden="true" class=""><path d="M512 64C264.6 64 64 264.6 64 512s200.6 448 448 448 448-200.6 448-448S759.4 64 512 64zm165.4 618.2l-66-.3L512 563.4l-99.3 118.4-66.1.3c-4.4 0-8-3.5-8-8 0-1.9.7-3.7 1.9-5.2l130.1-155L340.5 359a8.32 8.32 0 0 1-1.9-5.2c0-4.4 3.6-8 8-8l66.1.3L512 464.6l99.3-118.4 66-.3c4.4 0 8 3.5 8 8 0 1.9-.7 3.7-1.9 5.2L553.5 514l130 155c1.2 1.5 1.9 3.3 1.9 5.2 0 4.4-3.6 8-8 8z"></path></svg></i></span></span>