message: Allow default for ctrl+shift+b, ctrl+shift+u in RTE
  fixes vector-im/riot-web#4750
diff: @@ -104,7 +104,11 @@ export default class MessageComposerInput extends React.Component {
  }
  // Allow opening of dev tools. getDefaultKeyBinding would be 'italic' for KEY_I
  - if (e.keyCode === KeyCode.KEY_I && e.shiftKey && e.ctrlKey) {
  + // Likewise protect bold and underline (in case some browsers use these as
  + // shortcuts for things).
  + if ([KeyCode.KEY_B, KeyCode.KEY_I, KeyCode.KEY_U].includes(e.keyCode) &&
  + e.shiftKey && e.ctrlKey
  + ) {
  // When null is returned, draft-js will NOT preventDefault, allowing dev tools
  // to be toggled when the editor is focussed
  return null;
  