File picker not respecting hidden files settings

[PVince81]

Steps to reproduce

1. Enable the text app (this is only for triggering the file picker)
2. Go to the files app
3. Make sure that "show hidden files" under the bottom left cog icon is unticked, so that hidden files stay hidden
4. Create a folder ".hidden"
5. Create a new text file
6. Click on the image icon in the toolbar and pick "Insert from Files", this will open the file picker

Alternative without the text app: run OC.dialogs.filepicker() in the JS console to open the picker

Expected result

Folder ".hidden" not shown in the list.

Actual result

Folder ".hidden" appears in the list.

Versions

Observed on 22.2.0 and master