v4.15.0

Enhancements

• Added high contrast outline to Popover, Card and Indicator (#2792)
• Removed overflow: hidden from Card (#2806)
• Truncated long sort options in ResourceList (#2809

Bug fixes

• Fixed incorrect used while importing from polaris-tokens (#2778)
• Fixed DropZone not supporting new file selection when allowMultiple is false (#2737)
• Fixed Pagination sizing on small screens with tooltips (2747)
• Fixed Popover setting a tabindex and other accessibility attributes on the activator wrapper when the activator is disabled (#2473)
• Added a verticalAlignment prop to ResourceItem to support control of content alignment (#2743

Development workflow

• Added check:custom-property job in travis (#2778)
• Exported missing OptionListProps (#2777)
• Omitted the Storybook AppProvider decorator for component examples which already contain an AppProvider (#2807)
• Added an omitAppProvider front matter concept to prevent automatic wrapping of component examples with an AppProvider (#2815)

Code quality

• Removed various type assertions and bumped test coverage (#2638)