fix(mp): 修复 v-if 和 v-slot 同时使用时 v-if 不起作用的 Bug

[chouchouji]

Issue

close #4847

close #5566

测试代码

<template>
    <Test>
        <template v-if="autoplay" #header>
            hidde很简单的好多好多话n
        </template>
        <template v-else-if="videoContext" #footer>fotter</template>
        <template v-else #dd>dd</template>
    </Test>
    <button @click="a">click me</button>
</template>

产物

[github-actions]

Size report

Path	Size
packages/size-check/dist/size-check.es.js	47.19 KB (0%)
packages/size-check/dist/style.css	2.82 KB (0%)
packages/uni-app/dist/uni-app.es.js	2.5 KB (0%)
packages/uni-h5-vue/dist/vue.runtime.esm.js	76.41 KB (0%)
packages/uni-mp-vue/dist/vue.runtime.esm.js	43.22 KB (0%)
packages/uni-mp-alipay/dist/uni.api.esm.js	14.75 KB (0%)
packages/uni-mp-alipay/dist/uni.mp.esm.js	8.02 KB (+0.44% 🔺)
packages/uni-mp-baidu/dist/uni.api.esm.js	11.33 KB (0%)
packages/uni-mp-baidu/dist/uni.mp.esm.js	9.71 KB (+0.33% 🔺)
packages/uni-mp-qq/dist/uni.api.esm.js	10.65 KB (0%)
packages/uni-mp-qq/dist/uni.mp.esm.js	7.63 KB (+0.43% 🔺)
packages/uni-mp-toutiao/dist/uni.api.esm.js	10.47 KB (0%)
packages/uni-mp-toutiao/dist/uni.mp.esm.js	9.45 KB (+0.37% 🔺)
packages/uni-mp-weixin/dist/uni.api.esm.js	11.65 KB (0%)
packages/uni-mp-weixin/dist/uni.mp.esm.js	7.97 KB (+0.42% 🔺)
packages/uni-quickapp-webview/dist/uni.api.esm.js	10.6 KB (0%)
packages/uni-quickapp-webview/dist/uni.mp.esm.js	8.19 KB (+0.41% 🔺)

[skiyee]

👋 请问目前这个 PR 短期内有被合并的可能 ？

[chouchouji]

👋 请问目前这个 PR 短期内有被合并的可能 ？

功能已经没问题了，代码最近一段时间会再优化下

[skiyee]

请问这个PR的优先级很低？目前有计划合并？经常遇到这种场景

[TAYUN]

很多场景需要用到vfor+vif+slot，希望能尽快合并。

[lonquan]

୧(๑•̀◡•́๑)૭ 3 个月了, 还舍不得 merged