多文件管理窗口

目前主页面只支持一个文件管理窗口，并且只能显示当前会话对应的文件管理。如果想要本地与远程，或者远程与远程进行传输文件时，无法同时在一个页面上，通过选取对应文件，直接拖动的方式进行文件传输，希望支持这个功能，或者目前有什么好的方法么？

No file or test is named. Start by locating the main page's current single file-management window and how it displays the current session's files. Define how local/remote or two remote managers can coexist and how selected files are dragged between them; done means multiple managers work together on one page for direct transfer.

Written by the indexing model from the issue text.