[vim] Add 'none' option for popup border

README-VIM.md

@@ -300,7 +300,7 @@ following options are allowed:
     - `xoffset` [float default 0.5 range [0 ~ 1]]
     - `highlight` [string default `'Comment'`]: Highlight group for border
     - `border` [string default `rounded`]: Border style
-        - `rounded` / `sharp` / `horizontal` / `vertical` / `top` / `bottom` / `left` / `right`
+        - `rounded` / `sharp` / `horizontal` / `vertical` / `top` / `bottom` / `left` / `right` / `none`
 
 `fzf#wrap`
 ----------

plugin/fzf.vim

@@ -667,6 +667,9 @@ function! s:border_opt(window)
   if !has_key(a:window, 'border') && !get(a:window, 'rounded', 1)
     let style = 'sharp'
   endif
+  if style == 'none'
+    return ''
+  endif
 
   let opt = ' --border=' . style
   if has_key(a:window, 'highlight')