Link Picker - unreachable document in a deeply nested folder structure

STEPS (to be performed with Firefox, then with Internet Explorer):
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• add the following structure under Documents: (screen0)

myfolder
_myfolder0
_myfolder1
_myfolder2
_myfolder3
_myfolder4
_myfolder5
_myfolder6
_myfolder7
_mydoc

• edit mynews1
• click [...] within Link
• try to select mydoc (first by clicking the folders in the treeview TV, then by clicking the folders in the listview LV)

You will notice that it is impossible to link to mydoc under Firefox, no matter how you reach it TV/LV.