ESCAPE_ KEY_ CLEARS_ FOCUS
Default enablement of Escape key handling to clear focus and escape the editor.
Prevents keyboard focus traps (WCAG 2.1.2) for hardware keyboard and switch-access users by allowing Escape to act as a local 'cancel' command, dropping focus from the editor.
Official guidance:
https://developer.android.com/design/ui/desktop/guides/interaction/keyboard
https://developer.android.com/develop/ui/views/touch-and-input/keyboard-input/navigation