fixed layout breaking on sub-pixel width of container
fixed layout breaking on sub-pixel width of container

in case the parent container width was not an integer, the free-form
layout broke the columns into two separate rows because the width was
set too large.

avdevs/concrete5,avdevs/concrete5,TimDix/concrete5,matt9mg/concrete5,matt9mg/concrete5,MichaelMaar/concrete5,MichaelMaar/concrete5,MichaelMaar/concrete5,matt9mg/concrete5,avdevs/concrete5,TimDix/concrete5,TimDix/concrete5