[Feature Request] VSelect - header/footer slots in the dropdown menu

[J-Sek]

Problem to solve

Currently, the only way to add content above/below the options list is to use #prepend-item and #append-item slots. They are designed to hold another "option", not a search field or a non-scrollable static content.

Proposed solution

With dedicated slots we would be able to support all the developers that need Select2-ish component - without hacks for suppressing mousedown and keydown and other compromises.

Visual draft

[KaelWD]

Related: #15014

Separate slots wouldn't be needed if that was something like

<template #list="{ props }">
  // header
  <VSelectList v-bind="props" />
  // footer
</template>

[J-Sek]

Good point... although I wonder... It would bring great value to the developers if we detach VSelectList as a reusable component - integrating VList, VVirtualScroll, search, selection, etc. In my opinion, it would still benefit from header and footer slots, as those could get some nice props through binding) This way, I won't need to build Select2 from absolute scratch when I want the dropdown on a button instead of the text field.