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Issue number: resolves #27913 --------- <!-- Please do not submit updates to dependencies unless it fixes an issue. --> <!-- Please try to limit your pull request to one type (bugfix, feature, etc). Submit multiple pull requests if needed. --> ## What is the current behavior? <!-- Please describe the current behavior that you are modifying. --> When determining what the changed month is, we grab the element at the center of the datetime and then grab the nearest calendar month. This works fine if the datetime is fully in view, but if the center point is out of the viewport then this will return `null`. As a result, scrolling in the datetime will break. ## What is the new behavior? <!-- Please describe the behavior or changes that are being added by this PR. --> - We now check scroll position instead of querying for DOM elements at coordinates. This allows the view to continue to update even if the entire calendar body is outside the viewport. ## Does this introduce a breaking change? - [ ] Yes - [x] No <!-- If this introduces a breaking change, please describe the impact and migration path for existing applications below. --> ## Other information <!-- Any other information that is important to this PR such as screenshots of how the component looks before and after the change. --> Dev build: `7.2.2-dev.11690996559.1019674a`