fdo#74014: More on broadcasting at appropriate places.

Also, call PostDataChanged() to re-paint re-calculated formula cells,
and brodcast only when pasting, not during file import.

(cherry picked from commit 8a36879eaf0977448b113c2239014d2e2b7ab258)
(cherry picked from commit 3d869cda8db03820dea8c4ba463eb155d05e933b)

Conflicts:
	sc/source/core/data/documen7.cxx
	sc/source/ui/undo/undobase.cxx
	sc/qa/unit/ucalc.cxx

Change-Id: I63161329d4bfe937f754773fd68c37e3836c4950
Reviewed-on: https://gerrit.libreoffice.org/7727
Reviewed-by: Eike Rathke <erack@redhat.com>
Tested-by: Eike Rathke <erack@redhat.com>