Method appendParticle

external/.scrollLibs.js:17405–17407

(particle)

    return this._touchParticleByString(str)
  }
  appendParticle(particle) {
    return this.appendLineAndSubparticles(particle.getLine(), particle.subparticlesToString())
  }
  hasLine(line) {
    return this.getSubparticles().some(particle => particle.getLine() === line)
  }