allow `attach:` to also search attachment content, especially if it is plain text

[t214c]

Have you searched for an existing feature request?

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Brief Summary

Allow attach: to search within attachment content, especially if the attachment is a plain text file

Example

No response

Context

No response

[droidmonkey]

This is tricky because attachments can be huge and slow down search significantly. I prefer a new prefix like in-attachment: and only searching mime type of text data.

[t214c]

That will be fine for me :) Thanks