- fix the problems addressed by the patch 1667343: * only distribute extra space between growable items, not all space * take hidden items and gaps into account for ALL grow mode layout * fix rounding errors by allocating the remaining pixels to the last item(s) - refactor the code to avoid duplication between row/column cases - use STL-like wxList methods instead of compatibility ones git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@45583 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775