Function updateCmSelection

src/codemirror.js:12258–12266

* Updates the CodeMirror selection to match the provided vim selection. * If no arguments are given, it uses the current vim selection state.

(cm, sel, mode)

     * If no arguments are given, it uses the current vim selection state.
     */
    function updateCmSelection(cm, sel, mode) {
      var vim = cm.state.vim;
      sel = sel || vim.sel;
      var mode = mode ||
        vim.visualLine ? 'line' : vim.visualBlock ? 'block' : 'char';
      var cmSel = makeCmSelection(cm, sel, mode);
      cm.setSelections(cmSel.ranges, cmSel.primary);
      updateFakeCursor(cm);
    }
    function makeCmSelection(cm, sel, mode, exclusive) {
      var head = copyCursor(sel.head);
      var anchor = copyCursor(sel.anchor);