Function cursorEqual

static/js/codemirror/keymap/vim.js:1465–1467

(cur1, cur2)

      return { line: cur.line, ch: cur.ch };
    }
    function cursorEqual(cur1, cur2) {
      return cur1.ch == cur2.ch && cur1.line == cur2.line;
    }
    function cursorIsBefore(cur1, cur2) {
      if (cur1.line < cur2.line) {
        return true;