message: add log messages on parsing fls file.
diff: @@ -485,10 +485,12 @@ export class Manager {
  and all output files will be check if there are aux files related. If so,
  the aux files are parsed for any possible bib file. */
  parseFlsFile(baseFile: string) {
  + this.extension.logger.addLogMessage('Parse fls file.')
  const rootDir = path.dirname(baseFile)
  const outDir = this.getOutDir(baseFile)
  const flsFile = path.resolve(rootDir, path.join(outDir, path.basename(baseFile, '.tex') + '.fls'))
  if (!fs.existsSync(flsFile)) {
  + this.extension.logger.addLogMessage('Cannot find fls file.')
  return
  }
  const ioFiles = this.parseFlsContent(fs.readFileSync(flsFile).toString(), flsFile)
  