add transpose stops line break working correctly

[Rachel Willmer]

Using Lilypond 2.2.4 on Gentoo Linux, I see the following curious
behaviour.

This file lays out beautifully in its original key. (G major).

If, however, I change the transpose command from "\transpose g g" to
"\transpose g a", then the second system does not break as commanded
after 4 bars, but instead attempts fit on 8 bars (which does not fit!)

Input file attached.

Great program, by the way!

Thanks
Rachel

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