Change content input box to a textarea

Aljoša Furlaničrequested to merge
issue/ckeditor_tooltips-3544595:3544595-change-content-input into 1.0.x
  • /js/build/CkeditorTooltip.js
  • /js/ckeditor5_plugins/CkeditorTooltip/src/ckeditortooltipview.js
  • /js/ckeditor5_plugins/CkeditorTooltip/src/styles.css
  • /package.json

Closes #3544595

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