Do not rebuild contents when UWT table is updated #2305
Merged
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A timer triggers a periodic update of the UWT table in the unit view. Each update clears the current contents of the table and rebuilds it from scratch. As a result, the list loses its scrolling state and scrolls back up.
This PR changes the behavior to update existing entries and only selectively delete and add entries as needed.
To match units to their entries in the table, a hidden id column has been added to the UWT table.
Closes #2296