minipage wierdness

[Garst R. Reese]

At the time of  the %t -> %text patch, something went weird with my
mini-pages.
Two minipages with 44%t separated by an hfil used to appear side by side
in lyx.
The %t went to pt, but changing it to %text made one appear under the
other and lost half of the minipages. This could also be related to the
isLineSeparator stuff. Definitely a regression. 
Garst