even on a short spreadsheet scrolling up and down leaves
the first/last row (depending on the direction of scroll)
unchanged until the scrolling stops.

http://people.freedesktop.org/~mst/calc_4.2_scrolling.webm

On larger document there are rendering artifacts during scrolling which go away
after scrolling for me and mstahl, but a bunch of people can show us piles of
horribly broken spreadsheets after scrolling, esp wheel scrolling

Revert "fdo#75026: Sometimes we need to update grid view...

while not being active."

This reverts commit 52cc88d6.

Revert "fdo#68961: Check visible range during scrolling, and re-paint if necessary."

This reverts commit e36c8a67.

Revert "Repaint grid view when the visible area changes."

This reverts commit b54c1a53.

Conflicts:
	sc/source/ui/app/scmod.cxx

Revert "Update visible ranges when updating the scroll bars."

This reverts commit 391a57ef.

Change-Id: Ie170308cba18a9a74c7c72daf07dfa0a4ef7bd13
Reviewed-on: https://gerrit.libreoffice.org/10350Tested-by: Michael Stahl <mstahl@redhat.com>
Reviewed-by: Kohei Yoshida <libreoffice@kohei.us>
Tested-by: Kohei Yoshida <libreoffice@kohei.us>