Optimal row height: Adjusts the height of the selected rows
to fit the content, causing the table to shrink.

This really is SetMinimalRowHeight, but until minimize
is also added, it is the most desirable optimization.

Change-Id: I90717b2752027404a85fd5eb01c68279996598ca
Reviewed-on: https://gerrit.libreoffice.org/60129Reviewed-by: Justin Luth <justin_luth@sil.org>
Tested-by: Justin Luth <justin_luth@sil.org>