Unhandled error when ungrouping group who shares name with sibling VM

[imbibe]

If a group shares it's name with a grouped VM an unhandled error occurs if you attempt to ungroup said group.

On occasion this can result in a freeze followed by crash.

However, if another group on the level being ungrouped to shares it's name with VM a warning is displayed.

I suggest handling the error and presenting the same warning.

Error:

Failed to save the settings of the virtual machine work to /[~]/VirtualBox VMs/work/work/work.vbox.

Could not rename the directory '/[~]/VirtualBox VMs/work/work' to '/[~]/VirtualBox VMs/work' to save the settings file (VERR_ALREADY_EXISTS).

Result Code: NS_ERROR_FAILURE (0x80004005) Component: SessionMachine Interface: IMachine {22781af3-1c96-4126-9edf-67a020e0e858}

Warning:

You are trying to move machine work to group which already have sub-group work.

Please resolve this name-conflict and try again.

[aeichner]

Please reopen if still relevant with a recent VirtualBox release.