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Performance tools for Flutter

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See package https://pub.dev/packages/web_benchmarks. We will need somewhere to submit our benchmark numbers to. Flutter uses Skia Perf so maybe we can do this for DevTools too. CC @mkustermann @kevmoo @sigmundch...

testing
devtools app performance

Could be potentially hidden by adding a short delay between removing the spinner and showing the home screen: ![screen_flash](https://github.com/flutter/devtools/assets/21270878/06d4472b-4a3e-47b5-9f58-a52a787f1038)

polish
fix it friday
P3

- Export har feature added. - Need some guidance regarding deserialising the har and offline support. *List which issues are fixed by this PR.* *Please add a note to `packages/devtools_app/release_notes/NEXT_RELEASE_NOTES.md`...

Note: can be post-V2 cleanup - Controller classes and view classes should be kept in separate libraries

inspector page

Link not giving access to github sources for the SDK: https://docs.flutter.dev/get-started/install/macos#downloading-straight-from-github-instead-of-using-an-archive Location of link: https://github.com/flutter/devtools/blob/master/CONTRIBUTING.md?plain=1#L48

good first issue
documentation
fix it friday
P2

There are two methods that traverse the inspector tree: - [childrenCount](https://github.com/flutter/devtools/blob/0771921492a9687452887febefa460b092bba307/packages/devtools_app/lib/src/shared/console/eval/inspector_tree_v2.dart#L137) - this method traverses the tree once to count all the nodes - [getRowIndex](https://github.com/flutter/devtools/blob/0771921492a9687452887febefa460b092bba307/packages/devtools_app/lib/src/shared/console/eval/inspector_tree_v2.dart#L161) - this method traverses the...

inspector page

Some suggestions based on the creation of `shared_preferences_tool`: https://github.com/flutter/packages/pull/6749 - [x] DevToolsClearableTextField: https://github.com/flutter/devtools/blob/master/packages/devtools_app/lib/src/shared/common_widgets.dart#L839 - done in https://github.com/flutter/devtools/pull/7979 - [x] RoundedDropdownButton: https://github.com/flutter/devtools/blob/master/packages/devtools_app/lib/src/shared/common_widgets.dart#L755 - done in https://github.com/flutter/devtools/pull/7979 - [ ] search and...

devtools extensions
P2

I can not see http network log. Only showing websocket log ___ **DevTools version**: 2.34.3 **IDE**: VSCode **Connected Device**: CPU / OS: arm64 (64 bit) android Connected app type: Flutter...

Trying to test offline functionality on performance tab in master branch. When I disconnect getting this : It infinitely gets stuck on loader Flutter 3.22.2 • channel [user-branch] • unknown...