ContextualMenu - Added support for custom component lengths and fixed aria-posinset value#4004

Merged

jspurlin merged 7 commits intomicrosoft:masterfrom

chang47:menusize

Feb 21, 2018

Commits on Feb 16, 2018

used correct indexing for focusable element idnex
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fixed focus element index
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Commits on Feb 17, 2018

add support for custom components to have their own lists
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update comment
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Commits on Feb 20, 2018

fixed the indexing to include moving to the next element
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reverted, the original change is correct
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Commits on Feb 21, 2018

resoled build problems
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