The fix for tdf#37223 creates native text tables
from the RTF clipboard data to insert them cell
by cell in Writer tables instead of OLE embedding.
Unfortunately, using Calc RTF clipboard data inserts
also the cells of the hidden rows (tdf#118676).
This improvement uses the HTML clipboard data
to paste only the visible rows.

Note: first the original patch 1) converted the clipboard
data to a temporary nested text table at the cursor position,
and 2) copied its already native table content to the
clipboard, and inserts it into the original target table.
This doesn't work with the HTML format (that inserts plain
text data within a text table cell instead of a nested
table). As a workaround, the patch removes the target text
table with the insertion point temporarily, creating the
native text table from the HTML clipboard data at the place
of the removed text table. After copying the converted
native text table data to the clipboard, the removed
table is restored, and the native clipboard data is inserted
at the original cursor position.

Change-Id: Iee5bb4027729ca1eab373029f176eeadc59388a8
Reviewed-on: https://gerrit.libreoffice.org/70425
Tested-by: Jenkins
Reviewed-by: László Németh <nemeth@numbertext.org>