縦分割 [screen-devel] vertical split

Here's a patch that does the vertical split. It doesn't put any delimiter between the windows, which can be disconcerting, since when you first create the new region (^A V), absolutely nothing noticeable happens. But if you ^A-tab you'll be in the new region, and a next will make something show up. This was a diff against 4.0.3, which I gather from Michael's comment may be the wrong thing to diff

[nekoharu]

screen4.0.2用. 縦分割パッチ.

[odz]

screen を vsplit するパッチ

[k1m]

screen 左右分割パッチ