The Dart debugger has a "rewind" feature that allows moving back the execution to the beginning of the current frame (or another frame on the call stack, given a count parameter).

But currently this feature seems impossible to use with Dart Code: when I right-click a stack frame all I see is "Copy Call Stack". I also tried typing "rewind" in the debugger view, and I got "Getter not found: rewind". And when we open the Dart DevTools from Dart Code, the Debugger tab is disabled so we can't enter the rewind command there either.

This is a feature request to add the "Rewind" feature in Dart Code in the context menu of a selected stack frame in the Call Stack view (in the Debug sidebar).
A Debug: Rewind command that can be bound to a key combination would be nice too (for quickly rewinding the current frame with a keystroke).

see also: dart-lang/sdk#38852
and: https://github.com/dart-lang/sdk/blob/master/runtime/observatory/lib/src/elements/debugger.dart#L418