bbbw authored Mar 09, 2020 and Marinus Schraal committed Mar 18, 2020

If a search is performed and allocation occurs and hides some results,
the 'visible' property of the widget in the FlowBox will be assigned
False. However, when a new search is performed, this property is not
updated to True, but the old value is kept. So, if the search results
for artist or albums happen to overlap with previously hidden results,
then last_child in _on_artist_flowbox_size_allocate() and
last_visible_child in _on_album_flowbox_size_allocate() can be None,
which will cause a crash.

To fix this, every time a new search is triggered all FlowBox widgets
set 'visible' to True.

Fixes #372