It's just that VBox sends all button events through the PS/2 port as regular
mouse events, and only the absolute position is available through their fake
PCI device. So input_server gets a mixture of B_MOUSE_DOWN|UP with relative
move of 0,0 and B_MOUSE_MOVED with the absolute positions but no button data.
Oddly app_server doesn't have problem with this when moving windows around, but
Tracker can't start a selection or drag. Also releasing the mouse in a menu
doesn't invoke it either.
VMware likely does the same which is why the vmware addon is implemented as a
filter that adds absolute position to passing messages and caches buttons, and
not a device. I went for a device naively and also to allow someone to disable
it with iroster if needed, but I will have to also add a filter I suppose.
François.
