[7.0] Allow itemSubMenuProvider to return a boolean

[kelseyyoung]

Pull request checklist

• Addresses an existing issue: Fixes #0000
• Include a change request file using $ yarn change

Description of changes

itemSubMenuProvider is used only for keytip code for the OverflowSet. It is used to know if an overflow item has a submenu. The function previously checked an array of "any" for existence of a submenu, however since it's just an "is defined" check a boolean works just as well. This is also needed if an overflow item's menu is deferred in any way, which means the definition of the sub menu doesn't yet exist but it should still indicate that it has a submenu

V8 change here: #17149

Focus areas to test

Added a unit test for a version of the callback that accepts a boolean

[codesandbox-ci]

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Sandbox	Source
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codesandbox-react-template	Configuration

[fabricteam]

Perf Analysis

No significant results to display.

All results

Scenario	Render type	7.0 Ticks	PR Ticks	Iterations	Status
BaseButton	mount	835	844	5000
Breadcrumb	mount	39606	39478	5000
Checkbox	mount	1465	1417	5000
CheckboxBase	mount	1214	1179	5000
ChoiceGroup	mount	4597	4610	5000
ComboBox	mount	864	832	1000
CommandBar	mount	7194	7166	1000
ContextualMenu	mount	12551	12680	1000
DefaultButton	mount	1049	1071	5000
DetailsRow	mount	3315	3372	5000
DetailsRowFast	mount	3350	3357	5000
DetailsRowNoStyles	mount	3207	3229	5000
Dialog	mount	1588	1623	1000
DocumentCardTitle	mount	1697	1724	1000
Dropdown	mount	2334	2361	5000
FocusTrapZone	mount	1622	1579	5000
FocusZone	mount	1690	1699	5000
IconButton	mount	1662	1646	5000
Label	mount	307	302	5000
Layer	mount	1868	1824	5000
Link	mount	397	411	5000
MenuButton	mount	1358	1372	5000
MessageBar	mount	1935	1961	5000
Nav	mount	3076	3058	1000
OverflowSet	mount	1307	1333	5000
Panel	mount	1366	1373	1000
Persona	mount	750	751	1000
Pivot	mount	1333	1334	1000
PrimaryButton	mount	1195	1218	5000
Rating	mount	7070	7080	5000
SearchBox	mount	1184	1193	5000
Shimmer	mount	2368	2379	5000
Slider	mount	1389	1397	5000
SpinButton	mount	4691	4736	5000
Spinner	mount	393	389	5000
SplitButton	mount	2992	2993	5000
Stack	mount	462	476	5000
StackWithIntrinsicChildren	mount	1459	1462	5000
StackWithTextChildren	mount	4348	4340	5000
SwatchColorPicker	mount	9718	9640	5000
TagPicker	mount	2571	2632	5000
TeachingBubble	mount	47904	47783	5000
Text	mount	406	399	5000
TextField	mount	1280	1260	5000
Toggle	mount	782	776	5000
button	mount	106	98	5000

[size-auditor]

Asset size changes

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

Baseline commit: f4d4223122469a5b3eeaaa1fb8fa5a8a311738a9 (build)

[msft-fluent-ui-bot]

🎉office-ui-fabric-react@v7.162.0 has been released which incorporates this pull request.:tada:

Handy links:

• Release Notes
• Official NPM Release
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