message: fix appending newcommand
diff: @@ -48,6 +48,8 @@ export class HoverProvider implements vscode.HoverProvider {
  if (hov) {
  const tex = this.findHoverOnTex(document, position)
  if (tex) {
  + const newCommand = this.findNewCommand(document.getText())
  + tex.texString = newCommand + tex.texString
  this.provideHoverOnTex(document, tex)
  .then(hover => resolve(hover))
  return
  