Folders already installed by shipped builds have no marker, and reconcile
refused them on every pass, so the stuck "copying…" row never recovered.
Reconcile now stamps such a folder in place when its `plugin.js` is byte
for byte the package's own half — that can only be our pre-marker copy,
and adopting it writes no files. Anything that differs is a standalone
plugin the user installed and is still never touched (#112450).
Co-authored-by: xxxigm <tuancanhnguyen706@gmail.com>
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