message: Fix tikzpicture bug
diff: @@ -53,7 +53,7 @@ function findTikzPictures(document: vscode.TextDocument) {
  line = document.lineAt(++lineNo)
  text = line.text.substr(0, 1000)
  endMatch = text.match(endRegex)
  - if (endMatch && endMatch.index) {
  + if (endMatch && endMatch.index !== undefined) {
  endColumn = endMatch.index + endMatch[0].length
  }
  } while (!endMatch)
  