discourse/test/javascripts/helpers/textarea-selection-helper.j...

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export function setTextareaSelection(textarea, selectionStart, selectionEnd) {
textarea.selectionStart = selectionStart;
textarea.selectionEnd = selectionEnd;
}
export function getTextareaSelection(textarea) {
const start = textarea.selectionStart;
const end = textarea.selectionEnd;
return [start, end - start];
}