Filter Box stopped working (Re: filtering also folders in Flat View)

PS:

In my view and from my experience, it would be great if in Mixed Flat View (probably also in Grouped Flat View), the above would not be the case.

I.e. when in Mixed or Grouped Flat View, simply everything (files and folders) would be filtered from the current view, no matter where the files are located.

In other words, even when files are located in a folder that itself is filtered out by the current contents of the Quick Filter Box, they would still be shown in Mixed or Grouped Flat View.

May I suggest making this into a feature request?

PPS: Currently, when in Grouped Flat View, it seems that the Quick Filter Box does nothing. Or am I doing something wrong?