message: remove MathPreview.jaxInitialized. It is not used. We can use MathPreview.mj.
diff: @@ -12,14 +12,12 @@ type TexMathEnv = { texString: string, range: vscode.Range, envname: string }
  export class MathPreview {
  extension: Extension
  - jaxInitialized = false
  color: any
  mj: any
  constructor(extension: Extension) {
  this.extension = extension
  import('mathjax-node').then(mj => {
  - this.mj = mj
  mj.config({
  MathJax: {
  jax: ['input/TeX', 'output/SVG'],
  @@ -36,7 +34,7 @@ export class MathPreview {
  }
  })
  mj.start()
  - this.jaxInitialized = true
  + this.mj = mj
  })
  }
  