DataTable: textarea as custom editor does not receive focus

[SergiusSidorov]

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Current behavior
Editable table cell with textarea as custom template does not receive focus.

Expected behavior
Textarea should receive focus.

Minimal reproduction of the problem with instructions

1. Create editable table
2. Create column with custom edit template. Put textarea in that template.
3. Click by cell to edit => textarea has been shown, but without focus

example here: http://plnkr.co/edit/KUtG8JDXd3SGhAJ9rhyX?p=preview

• Browser:
  Firefox 57, Chome 62