TinyMCE looses focus while typing

If the cleaner is enabled the editor looses focus after every keystroke, this only happens in Chrome. I looked into the code and found out the reason is the following:

$(iframeDocument).bind('input paste',function(e) {
// After timeout, paste is effective
window.setTimeout(function() {
var contentAfterPaste = editor._process(body.html(), settings);
body.html(contentAfterPaste);
}, 0);
});

If the function is only bound to 'paste' it start working again. I'm sure the 'input' part is there for a reason but I haven't found it yet?
After I changed the code to the following it seems to work in all major browsers:

$(iframeDocument).bind('paste',function(e) {
// After timeout, paste is effective
window.setTimeout(function() {
var contentAfterPaste = editor._process(body.html(), settings);
body.html(contentAfterPaste);
}, 0);
});