make it approximately infinitely faster

a) add a method AdjustEntryHeightAndRecalc that just does AdjustEntryHeight and
RecalcViewData and replace all the places that do the two of those together
with that utility

b) in our SetFont now only call AdjustEntryHeightAndRecalc if the new font is
different to the old font, ignoring color which doesn't have a bearing on row
size.

c) where we originally called SetFont(GetFont()), which would have triggered
AdjustEntryHeightAndRecalc, now call the new AdjustEntryHeightAndRecalc
explicitly.

The performance problem apparently a regression from
ac7acb0a where we seem to now end up drawing on
ourself and calling SetFont on ourself rather than on a pImpl without an
overridden SetFont. So when we redraw on scrolling we triggered a cascade of
calculations and force text layout of every row.

(cherry picked from commit 3b6e61c3)

Conflicts:
	include/svtools/treelistbox.hxx

Change-Id: I3c284c360f06ac383e8c38045fc4c2946f505b35
Reviewed-on: https://gerrit.libreoffice.org/3611Reviewed-by: Tor Lillqvist <tml@iki.fi>
Tested-by: Tor Lillqvist <tml@iki.fi>