[PATCH] Robust basic_filebuf::imbue

[David Krauss]

Yikes, there was some very unfortunate commenting in those testcases!

Furthermore, when I uncommented that, one of them failed! But I don't think the bug is in the current code, it's preexisting in basic_filebuf::seekoff, and looks related to something I was already aware of and wanting to fix. It is not returning the correct state with the position in unbuffered mode. So, for now I'm "adding a regression." Will add a fix in a separate patchfile after sleep.

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