Can't download a folder while other downloads are in progress

[teo8976]

Steps to reproduce:

• connect to a server
• on the right (remote) panel, right-click on a folder and do "Download folder". Make sure you pick a folder that will take a while to download.
• While the files are being added to the queue and downloaded, right-click on another folder in the remote panel

Expected: the option "Download folder" in the dropdown menu should be available, and by clicking on it you should be able to appending also the new selected folder's content to the queue for download. There's no reason whatsoever why you shouldn't be able to do that just "because" queuing and/or downloading of files from another folder is in progress

Observed: the option "Download folder" is greyed out until the current download is finished.