Tray task start looping after dragging a file object from Host to Guest

[SchweizerGarde]

When I try to drag file objects from my Windows 10 1803 64bit Host-Desktop to the Desktop of Windows 10 1803 32 bit Guest, VirtualBox Guest Additions Tray Application immediately starts to loop during creating interrupts. After passing to the Guest windows, the drag indicator changes "Cannot drop".

This is fully reproducible. When dragging extremely slow, the drop may succeed.

[SchweizerGarde]

Screenshot of task manger showing the looping components

[SchweizerGarde]

Vbox log of the session with the loop

[SchweizerGarde]

The file object used to drag/drop

[Socratis]

Funny... That's a 1 byte file? With one <Space> in it (0x20)? Because it looks awfully close to #17443, #18109.

Awfully close... ;)

[SchweizerGarde]

Replying to socratis:

Funny... That's a 1 byte file? With one <Space> in it (0x20)? Because it looks awfully close to #17443, #18109.

Awfully close... ;)

Hi socratis, the size of the file does not matter. The problem occurs with files of any size: From 0 to many MB.

Regards SG

[SchweizerGarde]

Here comes a little more detail:

The Tray-task starts looping when the drag is terminated by either dropping the object or dragging out of the Guest window. During the drag itself, the dragging symbol "Not possible" is shown. AFAIK the handling of the dragover messages is buggy.

This is quite annoying, because the loop also starts, when a Guest Windows is simply passed by a DnD move with both source and target on the host. Workaround is simply disabling DnD.

Regards SG