When creating a new page without using a page break, before a page
break, there was a remaining indicator. These are now checked and
removed to avoid such cases.
- When the mouse pointer enters or leaves the headers / footers, show or hide
the header / footer control immediately. Waiting for that to appear is
annoying; and similarly for disappearing - one usually ended up clicking the
header / footer area to speed that up, and had a feeling of misbehaving.
- Few related re-paint improvements