Issue #2707291 by Utkarsh_33, lauriii, darvanen, samuel.mortenson, hooroomoo,...

Issue #2707291 by Utkarsh_33, lauriii, darvanen, samuel.mortenson, hooroomoo, komalk, narendraR, Vidushi Mehta, sasanikolic, droplet, smustgrave, yoroy, Bcwald, kostyashupenko, penyaskito: Disable body-level scrolling when a dialog is open as a modal