keyboard mouse not functional on host after dock(or unplug/plug mouse/kb)

[donemo]

Steps to reproduce:

1. Host has usb mouse plugged in.
2. Run VBox. Start VM.
3. Notice mouse still works on host.
4. Unplug, replug mouse
5. Notice Mouse is now not functional on host.
6. Notice Mouse is now grabbed by Virtualbox and passed to VM, though no filter exists.

Note mouse/keyboard grabbed with no filter or even when filter is created and disabled.

Expected behavior:

5. Mouse not grabbed by Vbox unless filter is created and enabled.

This is greatly undesirable for docking scenarios. If vitualbox is running and laptop is undocked/docked. Mouse/keyboard are not functional. Only apparent workaround is open up laptop use touchpad to manually disable grabbed mouse/keyboard or save and re-run VM.

Reproduces on 5.1.28, 5.1.29 r118065, and previous versions.

[Socratis]

In order to better understand the problem you need to submit some more information. Please read the following: ​Minimum information needed for assistance. Specifically for the VM log file ("VBox.log.zip"), here's what you do:

• Start the VM. Not from a saved or paused state. Clean start.
• Take the steps required to generate/observe the error.
• Shut down the VM. Not saved or paused. Completely shut down. If you can't shut it down by normal means, close the VM window and select "Power off".
• Right-click on the VM in the VirtualBox Manager. Select "Show Log..."
• Save it (only the first VBox.log), ZIP it and attach it to your response.

I would also like to see the "recipe" of the VM, the ".vbox" file:

• Right-click on the VM in the VirtualBox Manager. Select "Show in Finder/Explorer/Whatever".
• ZIP the selected ".vbox" file and attach it to your response.