When i click on some text in codemirror, i then can successfully highlight any text with my keyboard. However, if i attempt to highlight text with my mouse, it rarely works well. Often, text is not highlighted / selected at all, or if it does it stops are a couple of characters no matter how much I continue to move my mouse. It is unpredictable and inconsistent, since it occasionally works. Has anyone ever encountered this problem? What could be wrong?