message: Set flag before mutating on cut too
diff: @@ -210,8 +210,8 @@ export default class BasicMessageEditor extends React.Component {
  event.clipboardData.setData("application/x-riot-composer", JSON.stringify(selectedParts));
  if (type === "cut") {
  // Remove the text, updating the model as appropriate
  - replaceRangeAndMoveCaret(range, []);
  this._modifiedFlag = true;
  + replaceRangeAndMoveCaret(range, []);
  }
  event.preventDefault();
  }
  