migrate to mathjax 3

• currently running with mathjax 2.7.0

• major version is available mathjax 3.0.0 with many improvements

• require to modify modules/plugin_dbui/dbui.py

    "mathjax", {
            "css": None,
            "debug": "static/plugin_mathjax/es5/tex-chtml.js",
            "lg": None,
            "libmin": "static/plugin_mathjax/es5/tex-chtml.js"}

• require to modify src/plugin/MathJax.js. Few minor improvements. The core is in:

    onProcessMath: function () {
  
        "use strict";
  
        var me = this,
            dom = Ext.getDom(me.target.getEl());
  
        if ((!me.activated) || (dom === null)) {
            return;
        }
  
        // mask the viewport, MatJax process and unmask
        me.viewport.mask(me.textMask);
        MathJax.typeset([dom]);
        me.viewport.unmask();
    }

• require to modify views/plugin_dbui/index.html:

    <script>
        window.MathJax = {
          tex: {
            inlineMath: [['$','$']],
            displayMath: [['$$','$$']],
            processEscapes: true
          },
          options: {
            renderActions: {
              addMenu: [],
              checkLoading: []
            },
            ignoreHtmlClass: 'tex2jax_ignore',
            processHtmlClass: 'tex2jax_process'
          }
        };
    </script>

• in dec 2019, first tentative in the branch 33-python37-matjax3. It was almost working, but latex equation are not translated after an record update...

• to be worked again may be with an update version of MathJax

• update git repository of plugin_dbui/static/plugin_mathjax

• ...