if version >= "700" "{{{1
version 7.0
+" Narrow buffer with \w.
+call Mapping("w", ":NarrowRegion<CR>:<CR>")
+" Narrow window with \W.
+call Mapping("W", ":NarrowWindow<CR>:<CR>")
+
" Helper to show tab name.
fun! <SID>TabName(label, gui) "{{{2
let l:label = a:label