When is a conversation 'new'

[Kenneth Feldt]

I posted this a couple of months ago with no feedback --- but since the issue remains - I'll ask again.

Our mobile (web) app is attempting to create a conversation (POST) based on an image captured by a phone. Ideally, we want the subject line to be 'homework attempt at problem 3-45'. But that isn't always working (subject is sometimes ignored).

The conversations API describes the 'subject' line: 

 'The subject of the conversation. This is ignored when reusing a conversation.'

1. How, from the API, do we know if a conversation is being 're-used' and that the subject will be ignored?
2. Is it possible to create a new conversation, among the same recipients as a previous conversation, but change the 'subject' line?

Hope someone can shed light on this.

[Kenneth Feldt]

If anyone is interested - the API call to add a new conversation worked with 'group_converation=true'. With that setting, all worked well. With group_coversation set to false, the new message would be attached to a previously existing conversaton.