[DevTools] Give a distinct color to the root #34690
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This represents the "Initial Paint" (or "Transition" if a client navigation is selected). We'll later support more environments and the tooltip indicates which environment.
Give it a background while selected.
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This was referenced Oct 3, 2025
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Stacked on facebook#34654. The root is special since it represents "Initial Paint" (or a "Transition" when an Activity is selected). This gives it a different color in the timeline as well as gives it an outline that's clickable. Hovering the timeline now shows "Initial Paint" or "Suspense". Also made the cursor a pointer to invite you to try to click things and some rounded corners. <img width="1219" height="420" alt="Screenshot 2025-10-02 at 1 26 38 PM" src="https://github.com/user-attachments/assets/12451f93-8917-4f3b-8f01-930129e5fc13" /> <img width="1217" height="419" alt="Screenshot 2025-10-02 at 1 26 54 PM" src="https://github.com/user-attachments/assets/02b5e94c-3fbe-488d-b0f2-225b73578608" /> <img width="1215" height="419" alt="Screenshot 2025-10-02 at 1 27 24 PM" src="https://github.com/user-attachments/assets/c24e8861-e74a-4ccc-8643-ee9d04bef43c" /> <img width="1216" height="419" alt="Screenshot 2025-10-02 at 1 27 10 PM" src="https://github.com/user-attachments/assets/d5cc2b62-fa64-41bf-b485-116b1cd67467" /> DiffTrain build for [2e68dc7](facebook@2e68dc7)
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Stacked on facebook#34654. The root is special since it represents "Initial Paint" (or a "Transition" when an Activity is selected). This gives it a different color in the timeline as well as gives it an outline that's clickable. Hovering the timeline now shows "Initial Paint" or "Suspense". Also made the cursor a pointer to invite you to try to click things and some rounded corners. <img width="1219" height="420" alt="Screenshot 2025-10-02 at 1 26 38 PM" src="https://github.com/user-attachments/assets/12451f93-8917-4f3b-8f01-930129e5fc13" /> <img width="1217" height="419" alt="Screenshot 2025-10-02 at 1 26 54 PM" src="https://github.com/user-attachments/assets/02b5e94c-3fbe-488d-b0f2-225b73578608" /> <img width="1215" height="419" alt="Screenshot 2025-10-02 at 1 27 24 PM" src="https://github.com/user-attachments/assets/c24e8861-e74a-4ccc-8643-ee9d04bef43c" /> <img width="1216" height="419" alt="Screenshot 2025-10-02 at 1 27 10 PM" src="https://github.com/user-attachments/assets/d5cc2b62-fa64-41bf-b485-116b1cd67467" /> DiffTrain build for [2e68dc7](facebook@2e68dc7)
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Stacked on #34654.
The root is special since it represents "Initial Paint" (or a "Transition" when an Activity is selected). This gives it a different color in the timeline as well as gives it an outline that's clickable. Hovering the timeline now shows "Initial Paint" or "Suspense".
Also made the cursor a pointer to invite you to try to click things and some rounded corners.