[Reg 3.6->4.0-rc1] Import Existing Project doesn't filter files by type

Here's how to reproduce the problem:

Go to File -> New File or Project ... -> Import Project -> Import Existing Project and follow the instructions until it comes to select files to be imported.

In Creator 3.6.1 files to be imported are filtered by default and this is what I see:

import-3.6png

In 4.0 RC1 the filtering no longer works and this is what I see:

import-4.0-RC.png