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Performance tools for Flutter

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Hey, i think a feature that allows me to debug my SharedPreferences inside the dart devTools would be extremely handy, For example a way to view all the existing keys...

enhancement
new feature
P2

When using the debugger, I've often wanted a full text search of the app. This would be to do things like search for locations where I want to put breakpoints.

enhancement
screen: debugger
P3

This could include specific filter options like "filter by file extension ___ " or "only assets", etc.

screen: app size
P2

We could do things like - [ ] highlight the hovered cell on mouse over to make it look more clickable - [ ] give the treemap blocks thicker borders...

polish
screen: app size
P2

There are two parts of this problem: single file analysis, and diff analysis. Single file analysis: - we could use a gradient (red for large code size nodes and gradually...

polish
screen: app size
P3

Example: `flutter run --dart-flags="--sample-buffer-duration=20"`

documentation
P3

Watching GPU + CPU usage in the timeline page is a reasonable first approximation for for power usage but we could do better by plumbing through Android and iOS APIs...

enhancement
new feature
P3

I'm not sure this is feasible yet, but transferring a user request over from https://github.com/flutter/devtools/issues/492. User's would like to be able to launch DevTools in their default browser.

P3
cross-screen

Similar to https://github.com/flutter/devtools/issues/481 Would be really nice to have a way to view the semantics tree. /cc @darrenaustin @goderbauer fyi

screen: inspector
new feature
P3

from @jacob314 "Elements from the State object that I often wish we did a better job of displaying to debug layout issues: State of animation and scroll controllers referenced by...

screen: inspector
P2