Broken selection bar

[johncarley]

Ionic version: (check one with "x") [ ] 2.x [ ] 3.x [x] 4.x

Ion2-calendar mode: (check one with "x") [x] components mode [ ] modal mode

I'm submitting a ... (check one with "x") [x] bug report [] feature request [ ] help me

Current behavior: when I select a date range between the end of one month and the beginning of another, the selection bar is broken.

Expected behavior: the selection bar must not break