TableViewCell size inconsistent in PopupExample

[mhdostal]

When the PopupController component displays attributes of the selected feature, sometimes the table view cells are too large and don't contract to fit the existing content in the cells. Also, the sizing can sometimes change when scrolling. This happens for both text-based attributes and boolean (yes/no) attributes. It happens in both normal and "Edit" mode and with empty and non-empty cells.

Testing using Toolkit v100.8.0 and ArcGIS Runtime SDK for iOS v100.8.0.
Xcode v11.4.1