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[CP] Avoid animation jank by setting FlutterViewController backgroundColor to clearColor (stable) #120130

@jmagman

Description

@jmagman

issue_link

#103847

Commit Hash

flutter/engine@1b132e4

Target

stable

Beta CP request at #120139

pr_link

flutter/engine#39436

Impacted Users

iOS end users on high-end iPhones

Impact Description

On certain iPhones (iPhone 13 and 14 Pro, Pro Max) iOS apps are janky. This very simple one-line fix seems to resolve it on these devices.

Workaround

No.

Risk

low

Test Coverage

yes

Validation Steps

Run a Flutter app with a scrolling list view on an iPhone 13/14 Pro/Pro Max and scroll to see jank. On this fix scrolling is smooth.

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Labels

cp: approvedApproved cherry-pick requestcp: merge-to-stableCherry-picks that should be merged to stablecp: reviewCherry-picks in the review queue

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