I am running on Windows 7, with XUbuntu 14.04 running in a VirtualBox VM. I have replicated this on versions of VirtualBox from 4.3.22 to 5.0. VirtualBox supports drag-and-drop from the host to the guest VM. It is possible to drag-and-drop files from the host to the XUbuntu desktop, and to various applications including Geany which can act as drag-and-drop targets. However Thunar windows are not shown as drag-and-drop targets (mouse pointer is a no-entry sign), and dropping on a Thunar window does nothing. How drag-and-drop should be implemented is a Linux desktop standard. Since other GTK-based applications can receive drag-and-drop from VirtualBox and Thunar can't, my first guess is that this is a bug in Thunar. Give me a shout if you have any debug code you'd like me to try. Do be aware though that I'm not a hugely experienced Linux user, and my day job is writing software for a living, not maintaining Linux! :) I'm happy to try stuff and report back with log files, but I don't have the experience or bandwidth to do kernel rebuilds or stuff like that.
https://www.virtualbox.org/wiki/DnDDebug Debug information: 20:58:56.091050 00007f0605cc4780 main Entered new window 0x1800007 ('xubu - File Manager'), supports Xdnd version=5 20:58:56.106636 00007f06044d3700 dndX11 Target window 0x1801f3d ('Thunar') is asking for data as 'text/uri-list' Xubuntu 20.04
For some reason we get "text/uri-list" as target of the drag context: https://git.xfce.org/xfce/thunar/tree/thunar/thunar-standard-view.c?h=thunar-1.8.12#n3604
Note: xfdesktop is affected also.
Note: xfdesktop not affected when testing with Manjaro Linux.
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