message: attempt to fix clash of Cmd-M on Mac. Should fix vector-im/riot-web#7047
diff: @@ -734,6 +734,7 @@ export default class MessageComposerInput extends React.Component {
  }[ev.keyCode];
  if (ctrlCmdCommand) {
  + ev.preventDefault(); // to prevent clashing with Mac's minimize window
  return this.handleKeyCommand(ctrlCmdCommand);
  }
  }
  