fix(compiler-core): fix for :key shorthand patchflag

[Doctor-wu]

close #10882

[github-actions]

Size Report

Bundles

File	Size	Gzip	Brotli
runtime-dom.global.prod.js	90.7 kB	34.5 kB	31.1 kB
vue.global.prod.js	148 kB (+6 B)	53.7 kB (+2 B)	48.1 kB (+46 B)

Usages

Name	Size	Gzip	Brotli
createApp	50.8 kB	19.9 kB	18.1 kB
createSSRApp	54.1 kB	21.2 kB	19.3 kB
defineCustomElement	53.1 kB	20.6 kB	18.8 kB
overall	64.5 kB	24.9 kB	22.6 kB

[quiteeasy]

In this PR, we lose the actual reference to the .exp property from the :key resolved in transformElement.ts within the returned function. As a result, the keyProperty injected as a prop in the vFor.ts exit function no longer references the actual expression of keyProp.

This change introduces bugs when we set :key on a <template> element, as the :key is not correctly attached to its children, same for other elements, they have a wrong .exp reference.

To address this issue, I have opened a PR that properly resolves the :key shorthand. Please review the PR and share your thoughts. Thank you.

[quiteeasy]

check #10942