Fix: flickering of items with large dividers in Overflow component

[ValentinaKozlova]

Previous Behavior

New Behavior

Related Issue(s)

• Fixes [Bug]: Flickering of items with large dividers in Overflow component #28711

[fabricteam]

Perf Analysis (@fluentui/react-components)

Scenario	Render type	Master Ticks	PR Ticks	Iterations	Status
FluentProviderWithTheme	virtual-rerender-with-unmount	75	73	10	Possible regression

All results

Scenario	Render type	Master Ticks	PR Ticks	Iterations	Status
Avatar	mount	631	642	5000
Button	mount	315	326	5000
Field	mount	1118	1098	5000
FluentProvider	mount	679	680	5000
FluentProviderWithTheme	mount	79	85	10
FluentProviderWithTheme	virtual-rerender	66	70	10
FluentProviderWithTheme	virtual-rerender-with-unmount	75	73	10	Possible regression
InfoButton	mount	11	8	5000
MakeStyles	mount	845	856	50000
Persona	mount	1722	1701	5000
SpinButton	mount	1360	1370	5000

[codesandbox-ci]

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Latest deployment of this branch, based on commit 55b2912:

Sandbox	Source
@fluentui/react 8 starter	Configuration
@fluentui/react-components 9 starter	Configuration

[fabricteam]

📊 Bundle size report

Package & Exports	Baseline (minified/GZIP)	PR	Change
priority-overflow createOverflowManager	4.324 kB 1.771 kB	4.162 kB 1.735 kB	-162 B -36 B
react-overflow hooks only	12.581 kB 4.73 kB	12.419 kB 4.687 kB	-162 B -43 B

Unchanged fixtures

Package & Exports	Size (minified/GZIP)
react-components react-components: Button, FluentProvider & webLightTheme	66.476 kB 18.474 kB
react-components react-components: Accordion, Button, FluentProvider, Image, Menu, Popover	202.879 kB 57.574 kB
react-components react-components: FluentProvider & webLightTheme	37.649 kB 12.34 kB
react-portal-compat PortalCompatProvider	6.48 kB 2.203 kB

_{🤖 This report was generated against d0e28b405dc91c4682aec72dd784767a3ce95c78}

[size-auditor]

Asset size changes

Size Auditor did not detect a change in bundle size for any component!

Baseline commit: 9509e950254d838cdfe3718a775ba5c78cb8f11a (build)