adapted layout algorithm to force all items (beside the last one get#447

tomsontom wants to merge 2 commits into3.xeclipse-efx/efxclipse-rt:3.xfrom

446-Improve_SashPane_so_that_Items_never_go_beyond_their_min-sizeeclipse-efx/efxclipse-rt:446-Improve_SashPane_so_that_Items_never_go_beyond_their_min-sizeCopy head branch name to clipboard