Elements-qt shows some leftover space in the Overview page after sending assets

In the Overview page, after sending an asset in its full amount (I mean the value of remaining asset is 0) in which case it disappears from the "Available" list, it seems like the total space in Balances stays the same, leaving a big leftover blank space.
After closing and opening again the wallet it is shown correctly.
Tested on elements 0.21.0.2 and v22.0.0rc2

Example 1 (after having sent various assets in their full amount):
Before closing the wallet:
After reopening the wallet:

Example 2 (after sending 1 asset in its full amount at a time):
After having sent 1 asset:
After having sent 2 assets:
After having sent 3 assets:
After having sent 4 assets:

Riproduci il problema nella pagina Overview di Elements-qt inviando gli asset nel loro importo completo e osservando l’elenco Available e l’area Balances prima e dopo aver riaperto il wallet. Confronta il layout dopo la scomparsa di ciascun asset; il lavoro è completato quando lo spazio vuoto residuo viene rimosso immediatamente senza riavviare il wallet.

Scritto dal modello di indicizzazione a partire dal testo della issue.