[PATCH] fix 45841, add regression

[Hans-Peter Nilsson]

On Tue, 5 Oct 2010, David Krauss wrote:

> Bug 45841 turned up an error in the automatic mode switch
> patch that the existing testsuite didn't. Fix the bug and add a
> regression (one that works on all platforms ;v) ; regression
> verified on Darwin). The regression is merged into a convenient
> existing file rather than a new 45841.cc file; is that OK?

Please no, put it in a separate file.

(Merging test-cases like *that* does cause confusion, moving
along a line of revisions, comparing test-results!)

brgds, H-P