message: Tweak a log message of synctexonref.
diff: @@ -241,9 +241,9 @@ export class Commander {
  }
  synctexonref(line: number, filePath: string) {
  - this.extension.logger.addLogMessage('SYNCTEX command invoked.')
  + this.extension.logger.addLogMessage('SYNCTEX command invoked on a reference.')
  if (!vscode.window.activeTextEditor || !this.extension.manager.hasTexId(vscode.window.activeTextEditor.document.languageId)) {
  - this.extension.logger.addLogMessage('SyncTeX fails. The document of the active TextEditor is not a TeX document.')
  + this.extension.logger.addLogMessage('Cannot start SyncTeX. The active editor is undefined, or the document is not a TeX document.')
  return
  }
  this.extension.locator.syncTeXOnRef({line, filePath})
  