Function onContextMenu

mini-code-edit/cm/lib/codemirror.js:1683–1718

(e)

      return coordsChar(x - offL.left, y - offL.top);
    }
    function onContextMenu(e) {
      var pos = posFromMouse(e), scrollPos = scroller.scrollTop;
      if (!pos || window.opera) return; // Opera is difficult.
      if (posEq(sel.from, sel.to) || posLess(pos, sel.from) || !posLess(pos, sel.to))
        operation(setCursor)(pos.line, pos.ch);

      var oldCSS = input.style.cssText;
      inputDiv.style.position = "absolute";
      input.style.cssText = "position: fixed; width: 30px; height: 30px; top: " + (e.clientY - 5) +
        "px; left: " + (e.clientX - 5) + "px; z-index: 1000; background: white; " +
        "border-width: 0; outline: none; overflow: hidden; opacity: .05; filter: alpha(opacity=5);";
      leaveInputAlone = true;
      var val = input.value = getSelection();
      focusInput();
      selectInput(input);
      function rehide() {
        var newVal = splitLines(input.value).join("\n");
        if (newVal != val) operation(replaceSelection)(newVal, "end");
        inputDiv.style.position = "relative";
        input.style.cssText = oldCSS;
        if (ie_lt9) scroller.scrollTop = scrollPos;
        leaveInputAlone = false;
        resetInput(true);
        slowPoll();
      }

      if (gecko) {
        e_stop(e);
        var mouseup = connect(window, "mouseup", function() {
          mouseup();
          setTimeout(rehide, 20);
        }, true);
      } else {
        setTimeout(rehide, 50);
      }
    }

    // Cursor-blinking
    function restartBlink() {