Error when deleting large number of files

[tsmaeder]

This is a linux-only problem. Here's how to reproduce:

1. Run the following nodejs program on Linux (Ubuntu latest LTS is my platform)

const nsfw = require('nsfw');

console.log(`watching ${process.argv[2]`}`);

const watch= nsfw(process.argv[2], events => {
   console.log('got events');
   event.forEach(element => {
      console.log(JSON.stringify({...element}));
}, {
   errorCallback: err => {
      console.error(err);
   }
}).then(instance => {
   instance.start();
   console.log('watch started');
});

the program expects as a paremeter with a large (> 1000) number of directories. A node_modules folder of a complex project makes for good test data.

2. In the Ubuntu "Files" file explorer, select all subdirectories of the dir you passed as a paramenter in 1. and hit the delete button
3. Observe: after a while, you get an error message in the console:

Error: Service shutdown: root path changed (rename or deleted) 

[tsmaeder]

The number of directories you need to delete to in order to provoke the bug is timing dependent: the relevant difference is that we get more than one even in the event buffer in InotifyEventLoop#work(). You can provoke this by putting a breakpoint in the loop reading the evnents in InotifyEventLoop#work(), for example on line 131.
I believe the problem stems from the fact that the renameEnd block uses renameEvent.isDirectory to determine that this is an event that describes the delete of a watched directory. However, what we should be looking at is the isDirectoryRemoval flag instead, as it's done in the remove block.