[Bug, EC; LTS]: Parts of main menu disappear when starting download

[robertSt7]

Pimcore version

v11.1.5

Steps to reproduce

Use either demo instance (demo.pimcore.com with light UI or demo.pimcore.fun with classic dark UI) and execute the following steps:

1. open any Data Object folder
2. select rows in the grid view
3. click on "CSV Export"
4. Click "OK" on Export dialog

Actual Behavior

As soon as you click the OK button and the dialog disappears you can see that thw bottom part of the main menu disappers (seems like it is moved out of the window, at least partly), see the before and after screenshots

before

after

I just could locate where the problem actual appears (when document.body.appendChild(iframe) is called in pimcore.helpers.download function) but have no idea why:

pimcore.helpers.download = function (url) {
    pimcore.settings.showCloseConfirmation = false;
    window.setTimeout(function () {
        pimcore.settings.showCloseConfirmation = true;
    }, 1000);

    let iframe = document.getElementById('download_helper_iframe');
    if (!iframe) {
        iframe = document.createElement('iframe');
        iframe.setAttribute('id', 'download_helper_iframe');
        document.body.appendChild(iframe);
    }

Expected Behavior

The main menu should not be influenced by doing a download

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
No data about Coverage
No data about Duplication

See analysis details on SonarCloud