Make Trash keyboard shortcut work with selected text

Problem
The Trash keyboard shortcut (Delete key) does not work when text is selected in the body of a received message, even when the selected text is immutable. This forces users to either deselect text with the mouse or use the kebab menu instead of the keyboard shortcut.

Request
Enable the Trash keyboard shortcut to work when text is selected in message bodies, or provide an alternative keyboard shortcut that works in all contexts.