v3.18.0

New components

• ActionMenu: Use for display of actions and action groups within the context of a header (#1653)

Enhancements

• Added the stopAnnouncements prop to Banner, which disables screen reader announcements when content changes (#1719)
• Add selectable prop to ResourceList component (thanks to @vict-shevchenko for the pull request)
• Allow Link and Button interactions when rendered as prefix/suffix within <TextField /> (#1394)
• Improve TextField so that character count is only announced on focus. (#1720)
• ActionList can now pass a unique accessibilityLabel to each Item (#1653)
• Greatly reduced complexity of Page > Header (#1653)
• Long Page > Header breadcrumb labels will now truncate instead of breaking layout (#1653)
• Improves performance of TabMeasure component (#1544)
• Added secondaryFooterActions prop to Card which adds an action list of secondary actions to the footer #1625

Bug fixes

• Fixes monochrome variant of Link and Button components to support multi-line link text (#1686)
• Fixed the first column of DataTable not rendering in iOS Safari (#1605)
• Fixed paint loss on scroll of TextField Spinner (#1740)

Documentation

• Mentioned that the Contextual Save Bar is now available for embedded apps through App Bridge directly #1721
• Mentioned Polaris icons in the Icon component documentation (#1693)
• Added an example to Card for custom action layout with a secondary action and a plain button (thanks to @sharoonthomas for the pull request)

Development workflow

• Updated Storybook to v5.1.9 (#1728)

Code quality

• Updated PositionedOverlay to no longer use componentWillReceiveProps(#1621)

Deprecations

• Card secondaryFooterAction is now deprecated. Set an array of secondary actions on the secondaryFooterActions prop instead #1625