Abort running command, if App.Close() is called

[skaldesh]

Right now, it is not possible to properly close the application, since the Run() command runs the shell and waits for the next readline() to finish. This requires that, if the App has been closed from outside, the user still needs to press enter in order for the close to succeed

[r0l1]

grumble/app.go

Line 324 in 39c3b8e

a.OnClose(a.rl.Close)

Changing this to OnClosing might fix this.

[lewisthompson]

Unfortunately the above suggestion does not work.

[skaldesh]

Things probably change anyway with #15

[skaldesh]

If #15 does not get merged, we should look for another opportunity.