fix(VCombobox): menu position may not update if multiple

[dima74]

Description

There is method onInternalSearchChanged in v-combobox. If combobox has multiple prop, then this method may return earlier than method updateMenuDimensions is called. It is the reason for issue #5082. This pr change onInternalSearchChanged method, so now updateMenuDimensions will always be called.

Motivation and Context

Fix #5082

How Has This Been Tested?

visually

Markup:

<template>
  <v-layout
    class="wrapper"
    align-end
  >
    <v-combobox
      chips
      multiple
      v-model="model"
      :items="items"
    />

    <v-spacer />

    <v-combobox
      chips
      multiple
      v-model="model"
      :items="items"
      :delimiters="[',']"
    />
  </v-layout>
</template>

<style scoped>
  .wrapper {
    height: 95vh;
  }
</style>

<script>
  export default {
    data: () => ({
      items: ['Gaming', 'Programming', 'Vue', 'Vuetify'],
      model: ['Vuetify'],
    }),
  };
</script>

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Improvement/refactoring (non-breaking change that doesn't add any feature but make things better)

Checklist:

• The PR title is no longer than 64 characters.
• The PR is submitted to the correct branch (master for bug fixes and documentation updates, dev for new features and breaking changes).
• My code follows the code style of this project.
• I've added relevant changes to the documentation (applies to new features and breaking changes in core library)

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[codecov]

Codecov Report

Merging #5888 into master will not change coverage.
The diff coverage is 100%.

@@           Coverage Diff           @@
##           master    #5888   +/-   ##
=======================================
  Coverage   89.14%   89.14%           
=======================================
  Files         262      262           
  Lines        5915     5915           
  Branches     1468     1468           
=======================================
  Hits         5273     5273           
  Misses        528      528           
  Partials      114      114

Impacted Files	Coverage Δ
...ages/vuetify/src/components/VCombobox/VCombobox.js	97.22% <100%> (ø)	⬆️

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[lock]

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