In auto-check mode only: If there's only one error and the user selects a suggestion and this does not lead to new errors, the popup should close automatically, as showing "no errors found" in the popup isn't that useful. Exception: if there's no error in the text and user still clicks on the icon, the popup must still open, because the user might want to change some advanced settings like rule activation/deactivation.
In auto-check mode only: If there's only one error and the user selects a suggestion and this does not lead to new errors, the popup should close automatically, as showing "no errors found" in the popup isn't that useful. Exception: if there's no error in the text and user still clicks on the icon, the popup must still open, because the user might want to change some advanced settings like rule activation/deactivation.