[Impeller] Turn `IMPELLER_PLAYGROUND_[LINE|POINT]` into real ImGui widgets.
Open
c: new feature
c: proposal
e: impeller
engine
P3
team-engine
triaged-engine
- Dominant language
- Dart
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Description
These started off as test-only ImGui macros that are actually just enclosed ImGui widgets with static state, and were changed into a separate struct/draw routine in [this PR](https://github.com/flutter/engine/pull/50602).
We could turn them into real ImGui widgets by using ImGui's actual identity/storage features.
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