This undoes a behavior change introduced in
7b18d1d3f1.
The intent was to have ClearValidationState do the right thing for a case
where a collection was bound to the empty prefix, and then used again with
TryUpdateModel.
This change was implemented by saying that a key like "[0].Foo" is a match
for the prefix of "Foo". This isn't really right, and it's only
interesting for the ClearValidationState case.
The problem is that we don't know what the keys look like for a
collection. We can assume that they start with [0] but that's not really a
guarantee, it's a guess.
This change fixes the behavior of StartsWithModel, and move the
responsibility for this case back into ClearValidationState.
This change also removes the call to ClearValidationState from
TryUpdateModel. If you need this behavior, then call ClearValidationState
manually. Trying to bind and then re-bind a model object isn't really what
we intend.
b557ca55d9