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When we enter hybrid composition mode we 'pause' the default RenderSurface (implemented by SurfaceView or TextureView) and swap to an ImageReader based RenderSurface. When we return from hybrid composition mode we recreate and re-initialize the real RenderSurface as if it was being used for the first time. This broke Platform Views in an internal app b/306122497 because we would incorrectly tell the texture to attach when it was never detached. This CL changes the protocol so that when we return from hybrid composition mode we only swap the RenderSurface and do not re-create it. This avoids doing a bunch of unnecessary work and fixes the logic error of re-attaching textures that were never detached. *Replace this paragraph with a description of what this PR is changing or adding, and why. Consider including before/after screenshots.* *List which issues are fixed by this PR. You must list at least one issue.* *If you had to change anything in the [flutter/tests] repo, include a link to the migration guide as per the [breaking change policy].* [C++, Objective-C, Java style guides]: https://github.com/flutter/engine/blob/main/CONTRIBUTING.md#style