Session switch causes extreme lag (unnecessary I/O)

[benjiwolff]

I am using auto-session. When I switch to/away from my .NET solution, many buffers are added/deleted at the same time. It seems that for every single buffer that is added/deleted in that moment, the entire project is searched for "positions" (tests I guess).

This is extremely heavy on the filesystem and takes multiple minutes in my case. During that time, unrelated I/O is also affected (e.g. telescope file search prompt is blank in unrelated directories after a session switch).

[benjiwolff]

Also, I am not sure why BufDelete has to trigger discovery. Maybe that could be dropped entirely?