Focus needs to be discussed in depth along with the model for how multiple EditContext objects can be associated with a document

[BoCupp-Microsoft]

[ssanupam24]

Should focus be tightly coupled with SIP? or do we need a separate API to set SIP display policy (manual/automatic)?

[dlibby-]

Leaving this open for now, will sync up on thinking here

[dlibby-]

After further discussion, we're going to have a complimentary focus model, where the focus/active element and tab indexing won't change, key events will still be sent to the focused element, but editing events will be dispatched on the EditContext. I'll need to explain these sequences of events, including composition