How to reproduce it :

• open the resource explorer panel,
• launch a search : for example "int"
• select the "Images fonctionnalités" folder
• reduce (using the - icon) this selected folder
• verify that the "Images fonctionnalités" folder is still selected
• click on the refresh button > the "Images fonctionnalités" folder is automaticaly expanded
• Then I don't now exactly what I do, but I realise that some files appear out of their folder. This files cannot be selected, when I expand the whole panel, I see that this files are also in their origin folder so they seems to be duplicated and there is no way to get again the real tree without closing and open again the whole resources explorer panel .

I reproduce it several times on Firefox without urgency, selecting and clicking slowly. I never reproduced it on Chrome.

I reproduce it also when I am creating a link in a content edition.