#357 dot expansion inconsistent

[Stavros Macrakis]

ma: matrix([a11,a12],[a21,a22])$
mb: matrix([b11,b12],[b21,b22])$

ma.mb => multiplied out (OK) -- call it mab
q.ma.mb => q.mab (OK)

but

ma.mb.q => ma.mb.q -- that is, ma.mb doesn't get
multiplied out.

This is inconsistent, since "." is known to be associative
(dotassoc = true).

[Robert Dodier]

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Still present in 5.9.3cvs.