Arduino freezes when deleting active project folder

[ulfstottmeister]

Steps to reproduce the error:
(Warning: make a backup of the project in question first!)

1. Open a project in Arduino.
2. Click "Save As.."
3. In the Dialog, browse to the project folder of the current project
4. Delete the folder within the "Save As.." Dialog.

This makes Arduino hang everytime.
Tested on Windows, Arduino 1.8.4

[per1234]

Closing as duplicate of
#5191
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