fix: fix injection symbol(clientData) failure caused by HMR, close #1715

[pengzhanbo]

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What is the purpose of this pull request?

• Bug fix
• New feature
• Documentation update
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Description

resolve #1715.

From a shallow analysis, this is a bug caused by the module-level constant symbol('clientData') being replaced with a new constant during hot updates.

This PR can fix the issue.

However, the deeper reason is that every time markdown is updated, two import.meta.hot.accept callbacks are triggered. In these callbacks, the component chunk returns a new object (a new component) each time, and one is asynchronous while the other is synchronous:

1. Vue plugin callback: executes reload or rerender
2. Vuepress callback: executes updatePageData

Internally, there is a race condition rewriting of the hot-updated components between these two, and the problem may have started from this point.

Regarding the hot-update issue from markdown to Vue, I believe it is necessary to rewrite it appropriately to fundamentally solve such problems.

Screenshots

Before

After