fix vis:pipe buffer support detection

Check a vis:pipe function call like we would call it in vis_pipe.
Omitting the fullscreen parameter causes the pcall to succeed, although vis does not support
using a string as data source.

1 files changed, 1 insertions, 1 deletions

diff --git a/util.lua b/util.lua
index a8ca1be..daaa3fd 100644
--- a/util.lua
+++ b/util.lua
@@ -31,7 +31,7 @@ function util.capture_cmd(cmd)
   return s
 end
 
-local vis_supports_pipe_buf = pcall(vis.pipe, vis, 'foo', 'true')
+local vis_supports_pipe_buf = pcall(vis.pipe, vis, 'foo', 'true', false)
 
 --- Wrapper for the two vis:pipe variants.
 -- If vis does not support vis:pipe(input, cmd), prefix the command