Fix a problem with the dropdown editor throwing an error when the cell value was represented by a td outside of the initial editor viewport.

[jansiegel]

Context

This PR modifies the autocompleteEditor's afterSelection hook callback to afterSelectionEnd to allow targeting the selected td element.
The afterSelection hook fires before the table is scrolled into position, so the selected cell may not be rendered yet at this point.

How has this been tested?

Added a test case.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature or improvement (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Additional language file or change to the existing one (translations)

Related issue(s):

1. handsontable/dev-handsontable#1724

Affected project(s):

• handsontable
• @handsontable/angular
• @handsontable/react
• @handsontable/vue
• @handsontable/vue3

Checklist:

• I have reviewed the guidelines about Contributing to Handsontable and I confirm that my code follows the code style of this project.
• I have signed the Contributor License Agreement
• My change requires a change to the documentation.

[github-actions]

Launch the local version of documentation by running:

npm run docs:review 5b34bbc90bebc34b8eae1ada2363924b4566caf0