Here's a profile where I click the button in testcase 1 three times: https://share.firefox.dev/4aCwhEI
Bug 1850834 Comment 16 Edit History
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Here's a profile where I click the button in testcase 1 three times: https://share.firefox.dev/4aCwhEI The three multi-hundred-millisecond restyles are the frame reconstruction in question here.
Here's a profile where I click the button in testcase 1 ~three~ two times: https://share.firefox.dev/4aCwhEI The resulting multi-hundred-millisecond restyles are the frame reconstruction in question here.