stop wobbling the window around on reload

ftplugin/idris2.vim

@@ -80,6 +80,7 @@ function! IdrisShowResponseWin()
 endfunction
 
 function! IWrite(str)
+  let view = winsaveview()
   if (bufexists("idris-response"))
     let save_cursor = getcurpos()
     b idris-response
@@ -91,6 +92,7 @@ function! IWrite(str)
   else
     echo a:str
   endif
+  call winrestview(view)
 endfunction
 
 function! IdrisReload(q)