v2.3.1 includes a preview feature enabled with the dart.previewFlutterCloseTagDecorations: true setting. This adds "closing tag" decorations to the closing parens of constructor calls within build methods.

This feature is behind a flag because it's incomplete, has sub-optimal performance and may not work reliably. It is being shipped solely for feedback on the idea and may require analyzer work in order to support in a reliable way.

Please post your feedback below!

Known issues:

These are things that (probably) can't be addressed without support from the analyzer.

• [Perf] Doesn't scale well due to reliance on Outlines, Highlights and repeated getHover calls
• Currently identifies build methods based on return type string (Widget)
• Only shows constructors, doesn't show end of lists (children, actions)

Suggestions:

These are things that can be improved in the preview.

• Support const as well as new
• Prefix with // instead of / so looks a bit like a comment marking the end
• Improve styling
• Fix flicker when typing quickly (or holding keys) caused by not being able relate analyzer notifications with document versions - just keep resetting a timeout and only update after there's been no update for x milliseconds (where x > expected latency for the update)
• Show decorations in any Widget-returning method
• Don't show annotations against characters other than ) to mitigate out-of-sync notifications
• Allow color to be customised rather than reusing an existing style