dcdpr / jp / 27771366494

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fix(workspace): Skip `Id::store` write when content is unchanged (#767)

`Id::store` previously unconditionally overwrote the workspace ID file
on every call, bumping its mtime each time. This woke file watchers
(e.g. `cargo watch`) on every `jp` invocation, even when nothing had
changed.

Now the file is read first and the write is skipped when the on-disk
content already matches the new content exactly, leaving the mtime
untouched.

Signed-off-by: Jean Mertz <git@jeanmertz.com>

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