QtitanDataGrid has a feature - row auto height. The height of the row is adjusted automatically based on the cell contents. For instance when the grid's column change its width. For more details see RowAutoHeightFeature.exe example.
I have the same need, but with no answer for 2 years, I imagine that the answer is NO.
The worst is the auto height feature works badly with memo (often in my case, last line is not visible). I would accept that, but with no possibility for the user to adjust the row height manually, it is a nightmare.
This feature on our wishlist for a long time. We agree that it is in demand and it is actual, therefore we will add it to the next update (slider over the row's bottom border). Will work optionally on the row directly or at the row header - located on the left of the row.