message: Fix onPaste handler to work with copying files from Finder
diff: @@ -445,13 +445,11 @@ export default class SendMessageComposer extends React.Component {
  _onPaste = (event) => {
  const {clipboardData} = event;
  - // Prioritize text on the clipboard over files as Office on macOS puts a bitmap
  - // in the clipboard as well as the content being copied.
  - if (clipboardData.files.length && !clipboardData.types.some(t => t === "text/plain")) {
  - // This actually not so much for 'files' as such (at time of writing
  - // neither chrome nor firefox let you paste a plain file copied
  - // from Finder) but more images copied from a different website
  - // / word processor etc.
  + // Prioritize text on the clipboard over files if RTF is present as Office on macOS puts a bitmap
  + // in the clipboard as well as the content being copied. Modern versions of Office seem to not do this anymore.
  + // We check text/rtf instead of text/plain as when copy+pasting a file from Finder it puts the filename
  + // in as text/plain which we want to ignore.
  + if (clipboardData.files.length && !clipboardData.types.includes("text/rtf")) {
  ContentMessages.sharedInstance().sendContentListToRoom(
  Array.from(clipboardData.files), this.props.room.roomId, this.context,
  );
  