From our testing, VA X forgets the old name the next time there is a slight pause in typing.
We rename and immediately type the first letter of the old name - VA X suggests the old name as you describe. We backspace and pause for a second or two - VA X forgets the old name.
I'm afraid not (on VC6). I do the rename, backspace over the '.' that triggered the drop-down, pause 5 seconds and retype the '.'. The old name is still in the list. I've also tried saving all open files and this has no effect either. Closing and reopening the workspace has the desired effect.
using VC6 and VA 1538 I am having to wait about 15 seconds, even with an idle CPU, before the old name is forgotten. in contrast waiting 5 seconds is enough in VS2005
if you wait for 15 seconds, or a bit longer, does your VC6 catch up?
for me adding the VA "Reparse Current File" button to the VC6 toolbar and then using it after the rename causes VA to catch up immediately.
you should not have to reload the workspace for VA to catch up.
I have put in a case for this overly long delay in VC6