DevTools 2.13.1 release notes

The 2.13.1 release of the Dart and Flutter DevTools includes the following changes among other general improvements. To learn more about DevTools, check out the DevTools overview.

• This release included a lot of cleanup and reduction in technical debt. The most notable is the completion of our migration to sound null safety.
• Show release notes in IDE embedded versions of DevTools - #4053
• Polish to the DevTools footer - #3989, #4026, #4041, #4076

• Added a new feature to help you debug raster jank in your Flutter app. This feature allows you to take a snapshot of the current screen shown in your app, and then break down rendering time for that scene by layer. This can help you identify parts of a scene that are expensive to rasterize - #4046

  

• Added a scope setting for "Track Widget Builds", allowing you to specify whether widget builds should be tracked in your code only or in all code - #4010

  

• Use package uris instead of file uris in the CPU profiler "Source" column - #3932

• Fix scrolling bug with debugger breakpoints - #4074

• Add support for displaying flex values larger than 5 in the Layout Explorer - #4055

To find a complete list of changes since the previous release, check out the diff on GitHub.