#8 Drag project item and drop on file gives bad group

[Hugh Gibson]

If you drag a project item and drop it on a file, a group
is created based on the target file.

CProjectViewBar::OnProjectEndDrag has code to detect
this, but it doesn't work - probably because a DWORD
(result of m_ProjectTree.GetItemData) is being
compared with -1.

I changed the line:

if (m_ProjectTree.GetItemData(hItem) > -1)

to

if (m_ProjectTree.GetItemData(hItem) != -1)

and the code works correctly now.