Drag and drop of a folder in firefox gives no feedback

[nickvergessen]

With firefox uploading of folders is not possible. However instead of showing an error like in previous versions, currently you just get the "light blue" drag-n-drop color everywhere and nothing further happens.

Ref https://help.nextcloud.com/t/uploading-folders-not-possible/3106

[MorrisJobke]

let me debug this quickly.

[MorrisJobke]

let me debug this quickly.

#1406 solves the UI glitch and now behaves like stable9

[MorrisJobke]

Ref #83

[MorrisJobke]

Fixed in master - backport request pending