tags在项目的根目录，打开子目录下的文件，srcexpl显示定义未找到。

[hawkinchina]

类似：此问题：SrcExpl窗口显示定义未找到， 采用cscope优先查找，谢谢回复。
When open SrcExpl, and open a file in a sub dir, the current path will be change to that sub dir, therefore, if use cscope to open another file, the path of the file will not be found. Therefore cannot work with cscope.