:EnvimUsesOfSymbolAtPoint only works once

[megaannum]

Start vim and enter :Envim. After fulltypechecking, put cursor on classname
and enter :EnvimUsesOfSymbolAtPoint. Quickfix window opens with all
uses of the class (and syntax color highlighting goes away). Close
Quickfix window and repeat (put cursor on classname and enter
:EnvimUsesOfSymbolAtPoint). Nothing is displayed, no Quickfix window.
Now there is traffic in the log files but nothing is generated on the screen.

[megaannum]

Ok, seems like the problem is I would close the QuickFix window after using it (:q)
and Envim once the QuickFix window is closed will not re-open it. I assume everything
else with regards to :EnvimUsesOfSymbolAtPoint works but when it comes time
to write to the closed QuickFix window, nothing happens: no errors or anything.
So, I can work with always having a QuickFix window open, but I still think its
a bug that Envim does not re-create it if the user happens to close it.

[jlc]

You are true, there is a bug lying here, here is what happend:

When a reply from ensime is received (in TypecheckFileHandler, TypecheckAllHandler, UsesOfSymbolAtPointHandler), the quickfix list is filled up and opened, as well as a isOpen flag is set.

Unfortunately, the vim event BufWinLeave is not triggered when users are closing it, which does not reset the flag.
You know what follow...

However, the quickfixlist is properly filled up any time you execute the command :EnvimUsesOfSymbolAtPoint, it is simply not opened.
You can open it with :copen (and close it with :cclose).

I am testing in order to avoid another bug linked to this situation and shall push a patch soon.