Opt-in behavior preserving filter on selection in Multi-Select Combo Box

[rolfsmeds]

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Description

A toggle in the Multi-Select Combo Box component that preserves (i.e. doesn't clear) the typed-in filter when an item is selected.

Use cases

As a user I want the filter string to remain uncleared when I select items So that I can quickly select multiple items that match the same filter

Links

Feature request ticket: https://github.com/vaadin/web-components/issues/5930

Acceptance criteria

• [ ] Java setter: setPreserveFilterOnSelection(boolean), and corresponding getter
• [ ] WC/React property/attrib: preserve-filter
• [ ] Default is false, i.e. current behavior where the filter is cleared on selection
• [ ] The filter is still cleared on Esc and blur, as with current default behavior

General criteria

• [ ] APIs reviewed

• [ ] UX/DX tests in Alpha

• [ ] Documentation: To be added as a subsection under https://vaadin.com/docs/latest/components/multi-select-combo-box#selection (add link here when done)

• [ ] How to test?

• [ ] Limitations:

Security

• [x] Security implications have been taken into account (elaborate or link to product security requirement specification if there are implications)