Reland "Introduce the PipelineOwner tree (#122231)"#122452
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auto-submit[bot] merged 2 commits intoflutter:masterfrom Mar 13, 2023
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Reland "Introduce the PipelineOwner tree (#122231)"#122452auto-submit[bot] merged 2 commits intoflutter:masterfrom
auto-submit[bot] merged 2 commits intoflutter:masterfrom
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This reverts commit 670f9d2.
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This was broken in #122452. The culprit is that `PipelineOwner.ensureSemantics` doesn't turn on semantics for the entire app, it pretends to only turn it on for the local `PipelineOwner`. Unfortunately, that local `PipelineOwner` is never informed that it should produce semantics when semantics are not turned on globally. So, `PipelineOwner.ensureSemantics` is essentially without effect if semantics are not already turned on globally. I can't think of a use case where it would be useful to only turn on semantics for a particular pipeline owner and fixing `PipelineOwner.ensureSemantics` would get pretty messy with performance implications even if semantics are turned off. So, this PR deprecates that functionality and moves the `SemanticsDebugger` to the global semantics API. Fixes #147665.
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The changes to the original PR are in the second commit. I decided to remove the logic that automatically requests a visual update if the PipelineOwner contains dirty nodes when it is attached to a PipelineManifold. It was interacting badly with the bootstrapping logic and caused test failures. In practice, whoever is modifying/managing the PipelineOwner tree is also in charge of scheduling frames where appropriate when modifying the shape of the tree.