Consider following situation:

You are browsing some ftp archive with galleon and found file you wanna
download. The 'Save File' dialog appears with suggested filename in input
line, but unfortunatelly you are in wrong directory. So browse for a while 
in 'Directory' list, but what happens: as you click on dir (e.g. '..') once,
it replaces suggestet filename for download. After clicking second time it
changes dir, but inputline remains clear.

Work-around: use cut-n-paste

Possible fix: remember state of inputline before changing directory ?

sth like

directory_list_clicked ()
{
  if (! old_file_name)
    old_file_name = gtk_editable_get_chars (inputline, 0, -1);
 
  { ... }
}

change_directory () 
{
  { ... }

  pos = 0;
  if (old_file_name)    gtk_editable_insert_text(inputline, old_file_name,
      strlen(old_file_name), &pos) 
  old_file_name = NULL;
}  

on_inline_changed()
{
  {...}
  old_file_name = NULL;
}