title: Sublime Text 3 Newly opened file override existing file
body: <p>Say I have <code>/doc/index.html</code> opened in ST3, when I open another file like <code>/src/foo.html</code> or <code>/foo/index.html/</code> , the newly opened file override the existing file <code>/doc/index.html</code> !  That is, the existing file just disappear and is substituted by the newly opened file.  How can I solve that?</p>