- Attempt to update flicker-blanking-hack code (but disabled to disable it),
    using new kpView::setPaintBlank()
  - Remove excessive calls to QWidget::setUpdatesEnabled() that attempted to
    reduce flicker (also setUpdatesEnabled() does not require update() in Qt4)
  - Restore code that moves the mouse cursor so that it is still above the same
    document pixel as before the zoom (QWidget::visibleRegion() is the Qt4
    replacement for clipRegion())
  - zoomToRect()
    - Account for scrollbars and grips
    - Add "careAboutWidth" and "careAboutHeight" options
    - Combined, this allows us to re-enable:
      - "Fit to Page"
      - "Fit to Page Width"
      - "Fit to Page Height"

svn path=/trunk/KDE/kdegraphics/kolourpaint/; revision=722911