Inconsistent Emoji when sans-serif is Noto Sans CJK/Source Han Sans

Created by: Small-Ku

Bug report:

• Operating system and version: All system in concept, especially Linux distros that with Chinese support
• Browser and version: All browsers that can set font for sans-serif
• Reduced test case: https://jsbin.com/gobared/

Steps:

1. Set browser default sans-serif to Noto Sans CJK/Source Han Sans, which is commonly used as Chinese/Japanese/Korean font in Linux distros.
2. Open a site with Emoji that built with Bootstrap

Screenshot:

Suggested fix: Put Emoji fonts in front of text fonts like

$font-family-sans-serif:
  // Safari for OS X and iOS (San Francisco)
  -apple-system,
  // Chrome < 56 for OS X (San Francisco)
  BlinkMacSystemFont,
  // Emoji fonts
  "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol", "Noto Color Emoji",
  // Windows
  "Segoe UI",
  // Android
  "Roboto",
  // Basic web fallback
  "Helvetica Neue", Arial, "Noto Sans"
  , sans-serif !default;