runtime(netrw): Change line on mx if command output exists

closes: #15550

Signed-off-by: yasuda <yasuda@kyoto-sr.co.jp>
Signed-off-by: Christian Brabandt <cb@256bit.org>

runtime/autoload/netrw.vim

@@ -22,6 +22,7 @@
 "   2024 Aug 02 by Vim Project: honor g:netrw_alt{o,v} for :{S,H,V}explore (#15417)
 "   2024 Aug 15 by Vim Project: style changes, prevent E121 (#15501)
 "   2024 Aug 22 by Vim Project: fix mf-selection highlight (#15551)
+"   2024 Aug 22 by Vim Project: adjust echo output of mx command (#15550)
 "   }}}
 " Former Maintainer:	Charles E Campbell
 " GetLatestVimScripts: 1075 1 :AutoInstall: netrw.vim
@@ -7497,7 +7498,13 @@ fun! s:NetrwMarkFileExe(islocal,enbloc)
        NetrwKeepj call netrw#ErrorMsg(s:ERROR,"command<".xcmd."> failed, aborting",54)
        break
       else
-       echo ret
+       if ret !=# ''
+        echo "\n"
+        " skip trailing new line
+        echo ret[0:-2]
+       else
+        echo ret
+       endif
       endif
      endfor