Fix occasional empty rows in Table and TreeTable (#9551)

Fix occasional empty rows in Table and TreeTable (#9551)

There's an intermittently happening issue with both Table and TreeTable, which results in row data disappearing.
This change removes a method which is probably a vestigial one from over five years ago and other changes are handling the things the method used to perform. Currently the method removes rows deemed unnecessary from the row buffer. The problem is, those rows are visible to the user and removing causes row contents to be lost.
Also included are manually runnable test cases which demonstrate that this removal actually prevents the issue from happening.

Fixes #7964
Fixes #5030