I would like to tune dynamically and in a cross platform compatible way the height of a QTableWidget so that:

• No row is "cut" at the bottom of the table and scrolling is smooth (row separators do not move while scrolling).
• Last row bottom separator in the table matches exactly table bottom boundary.
• No scrollbar appears if the table has a number of rows that can fit precisely within the height of the table.

Assuming all rows have the same height, I thought a simple computation based on

• Header height: table.horizontalHeader().height().
• Plus a wished visible number of rows multiplied by table.rowHeight(0).

would make it, but I need for example on Windows to add 4 more pixels to that result to get the behavior I want, and on other platforms this is different. And sometimes it is even dependent on some OS setup.

Would you have any hints to compute the exact table height I need in a clean & cross-platform way?

Thanks a lot for your help.