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Allow the framework to compare Pictures #86806

@zanderso

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@zanderso

The new DisplayList can be extended to do more precise comparison of Picture objects. The ability of the framework to precisely compare Picture objects for equality opens up a number of possibilities. One example is allowing e.g. DevTools to suggest where to add RepaintBoundary widgets, which can reduce CPU utilization and improve raster cache performance.

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    P2Important issues not at the top of the work listc: performanceRelates to speed or footprint issues (see "perf:" labels)engineflutter/engine related. See also e: labels.team-engineOwned by Engine teamtriaged-engineTriaged by Engine team

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