c0-change-trigger option is removed in tmux 2.1

node_modules/vfs-local/localfs.js

@@ -1841,8 +1841,9 @@ module.exports = function setup(fsOptions) {
                 );
                 
                 // disable buffering of tmux output
-                // TODO investigate if using capture pane after desync is faster 
+                // old versions of tmux skip parts of output without this flag
-                args.push(";", "setw", "c0-change-trigger", "0");
+                if (parseFloat(TMUXNAME.substr("cloud9".length)) < 2.1)
+                    args.push(";", "setw", "c0-change-trigger", "0");
                 
                 if (options.output) {
                     args.push(