[Bug Report][2.6.0] VDialog, error after change "fix(VDialog): don't re-focus autofocused children"

[mlankamp]

Environment

Vuetify Version: 2.6.0
Last working version: 2.5.14
Vue Version: 2.6.14
Browsers: Edge 99.0.1128.0
OS: Windows 10

Steps to reproduce

• Create Dialog, sometime I see an error in the console:

TypeError: Cannot read properties of undefined (reading 'contains')
    at VueComponent.<anonymous> (VDialog.ts:190:16)
    at Array.<anonymous> (vue.runtime.esm.js:1989:1)
    at flushCallbacks (vue.runtime.esm.js:1915:1)

Expected Behavior

Additional check if this.$refs.content is not undefined

Actual Behavior

Reproduction Link

https://codepen.io/

[mlankamp]

I still have this issue, i've created a PR to fix this. How can I speed up the merge?

[jmarshall9120]

I get this same bug when trying to extend the dialog component

<template>
  <v-dialog v-bind="$props" v-on="$listeners">
    <template
      v-for="slot in Object.keys($scopedSlots)"
      :slot="slot"
      slot-scope="scope"
    >
      <slot :name="slot" v-bind="scope" />
    </template>
  </v-dialog>
</template>
<script>
import { VDialog } from 'vuetify/lib'
export default {
  name: 'DialogWHeader',
  extends: VDialog,
}
</script>
<style lang="scss"></style>

I'm on version: 2.6.13. I'm assuming the commit above is in this release.
Not sure how this works internally currently, running it down now. If anyone has some advice please feel welcome.

Update:

It looks like the this.$refs == {} at the time show() is called

    show() {
      !this.fullscreen && !this.hideOverlay && this.genOverlay(); // Double nextTick to wait for lazy content to be generated

      this.$nextTick(() => {
        this.$nextTick(() => {
          if (!this.$refs.content.contains(document.activeElement)) {
            this.previousActiveElement = document.activeElement;
            this.$refs.content.focus();
          }

          this.bind();
        });
      });
    },

Update 2

I've tracked it down a few hours now. It's something to do with the lazy content generation, not going off on the extended template.

[KaelWD]

https://stackoverflow.com/a/70064606/2074736