If Ctrl+D is unassigned from "delete line" in "Settings" > "Keyboard Shortcuts", then Ctrl+D should have the default CodeMirror behavior. This assumes that the beta editor is enabled.
Alt+drag also triggers multi-select.
If Ctrl+D is unassigned from "delete line" in "Settings" > "Keyboard Shortcuts", then Ctrl+D should have the default CodeMirror behavior. This assumes that the beta editor is enabled.
Alt+drag also triggers multi-select.