macOS: opening a file triggers cache reload and resets scroll position

[warpdesign]

On macOS:

1. select a file
2. press cmd+o to open the file in the finder

This opens the file as expected, but since the last open date of the file has changed, node file watch triggers a change even which in turns reloads the cache and resets the scroll position.

There isn't much that can be done to fix this. Maybe external npm watch modules have more grained support?

[warpdesign]

Closing: fixing #36 should fix this as well.