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Issue number: Internal --------- <!-- 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. --> The new picker component does not have a counterpart for the `prefix` and `suffix` properties on the old picker column. ## What is the new behavior? <!-- Please describe the behavior or changes that are being added by this PR. --> - `prefix` and `suffix` slots added. - Picker items wrapped in a new `.picker-opts` element for positioning purposes, similar to the legacy picker column. This necessitated additional changes to functionality and styling, since previously the items were direct descendants of the host. - New `setFocus` method added. This gets around a browser bug in Firefox where calling `focus()` on the column doesn't correctly move focus, as the nearest focusable element (`.picker-opts`) is in the shadow DOM. ## 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. --> While you can no longer call `focus()` on the column in Firefox and must use `setFocus()` instead, this isn't considered a breaking change because this component isn't public API yet. ## Other information <!-- Any other information that is important to this PR such as screenshots of how the component looks before and after the change. --> --------- Co-authored-by: ionitron <hi@ionicframework.com>