Resizable DrawerMenu produces unexpected behaviour of the TOC

[gioscarda]

Description

Investigations needed about the resizable DrawerMenu (see geosolutions-it/MapStore2#3767 ). Applying the following configuration, the TOC panel remains visible even if the layer settings panel (or the widget panel) opens (see the picture):

{
    "name": "DrawerMenu",
    "cfg": {
        "menuOptions": {
            "resizable": true
        }
    }
}

In case of Bug (otherwise remove this paragraph)

Browser Affected (use this site: https://www.whatsmybrowser.org/ for non expert users)

• [ ] Internet Explorer
• [x] Chrome
• [x] Firefox
• [ ] Safari

Browser Version Affected

• All

Steps to reproduce

• configure the DrawerMenu to be resizable
• open a map
• add a layer to it
• open the TOC
• resize the TOC to make it wider
• open the layer settings panel

Expected Result

• once the settings panel opens the TOC should be not visible

Current Result

• the TOC panel is still visible behind the layer settings panel

Other useful information (optional):

It happens with the widgets panel also.

[tdipisa]

We are reviewing the entire MS's layout (closed in favor of #4254).