message: fix: prevent backspace key triggering browser hotkeys
diff: @@ -323,6 +323,8 @@ function createOnKeyDown(
  (key === 'Backspace' && isSelectionAtStart(editor)) ||
  (key === 'Delete' && isSelectionAtEnd(editor))
  ) {
  + // prevent accidentally leaving page with backspace
  + e.preventDefault()
  if (!slateClosure.current) return
  const previous = key === 'Backspace'
  