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Performance tools for Flutter

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Hi i m a novice coder and i find lot of problems with navigator stack and i would like for it to be displayed with it's history and thank

P3
possible devtools extension

debugCheckElevationsEnabled is a new service extension to help debug elevation issues. We should support it in devtools as well as possibly directly in intellij and vscode. Related Flutter CL adding...

enhancement
screen: inspector
P2

This looks weird (and makes the URIs really long), I think they should show `package:` URIs. ![Screenshot 2019-03-14 at 12 58 44 pm](https://user-images.githubusercontent.com/1078012/54358735-f8fe6a00-4658-11e9-88ba-97aee952087f.png)

screen: debugger
P2
reproduce to verify

Originally from https://github.com/flutter/devtools/issues/1648.

screen: debugger
hummingbird
P3
cost: low

For example, the hot reload / hot restart actions in the toolbar.

documentation
P3

based on VM info Originally from https://github.com/flutter/devtools/issues/1648

screen: debugger
hummingbird
P3
cost: medium

Selected a bunch of different nodes in the inspector, opened layout explorer, switched pages in DevTools, came back to the inspector with the layout explorer open and selected a new...

layout explorer
reproduce to verify

There are cases such as displaying doc comments, autocompleting expressions, and getting types where having access to the analyzer service is needed. TBD: the most robust way to wire up...

P1

There's currently no visual change in the logging page when we lose the device connection. We should make sure there is (put a subtle transparent overlay on the logging items?),...

good first issue
screen: logging
polish
offline
P2

In flame_chart.dart, we call ``` linkedHorizontalScrollControllerGroup.jumpTo(newScrollOffset); ``` to update the scroll offset as we zoom. We call this inside of an animation controller listener `zoomController.addListener(() { ... })`. At times...

cpu profiler
flame_chart
P2
cost: medium