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iOS partial repaint was disabled #176166

@iamjinge

Description

@iamjinge

Steps to reproduce

bool force_full_repaint = external_view_embedder_ && (!raster_thread_merger_ || raster_thread_merger_->IsMerged());
The force_full_repaint is always true on iOS, because raster_thread_merger_ is always null.

I found flutter/engine#54540 was merged. Is there any plan to reland flutter/engine#54537?

Expected results

partial repaint

Actual results

no partial repaint

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    engineflutter/engine related. See also e: labels.platform-iosiOS applications specificallyteam-engineOwned by Engine teamwaiting for customer responseThe Flutter team cannot make further progress on this issue until the original reporter responds

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