ICE Graph Display Bug #939

Describe the bug
Despite steadily declining BGs with 0 IOB and 0 COB, ICE graph retroactively displays positive ICE bars during basal testing period after meal carbs are entered.

Attach an Issue Report
https://loop.zulipchat.com/user_uploads/8196/6lZYnAUObWS_h4osyEId_pr8/Loop-Report-2019-04-25-192143-0700.md

To Reproduce
Unsure if reproducible, I haven't attempted.
But steps that preceded noticing the issue:

1. Open looping for several hours for basal testing; 0 IOB, 0 COB for long duration with steadily declining BG.
2. At conclusion of basal testing I entered meal carbs.
3. Viewed ICE graph and noticed the upward green ICE bars during the period my BG had been declining.

Expected behavior
ICE display should not show upward pressure when no insulin counteraction has been encountered.

Screenshots

Phone

• Hardware: iPhone XS
• Software: iOS 12.2

Loop Version

• Version Number: 1.10.0DEV
• Repo: LoopKit/Loop/omnipod-testing

CGM

• Device: Dexcom G6
• Manager app: Dexcom App

Pump

• Manufacturer: Omnipod
• Model: Eros

Additional context
Originally reported/discussed in Zulip thread here.