[SF][ui5-list] we need to clear the previous focused item after list item changed.

[sfsf-xweb-sh]

Bug Description

hi, team

inner the list component there is a variable _previouslyFocusedItem for record the previous focused Item. when tab to the list and we can get the correct previous focused Item.

But there is some thing wrong, if the list item is changed, see below diagram.

I think for this case we need to clear the _previouslyFocusedItem. Or It will not focus the first new one.

https://github.com/SAP/ui5-webcomponents/blob/b89f91c0a2f8afb336f2269cc441566b3ebfdd2c/packages/main/src/List.js#L648

I think we need to add this._previouslyFocusedItem = null; in prepareListItems.

Context

• UI5 Web Components version: 1.6.0
• OS/Platform: /
• Browser: /
• Affected component: ui5-list

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• Functional issue - Medium or High
• Visual issue - Low or Medium

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