Display top contents in hover widget when focused
#2544
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This PR introduces a couple of useful helpers for dealing with widget operations:
black_boxerases the returning type of anOperation; so it can be fed toWidget::operate.chaincreates a sequence of operations; feeding the output of the first one to a function that creates a second one.These changes allow us to easily keep track of the focused state inside parts of the widget tree. For instance, the
hoverwidget now keeps displaying the widgets on top if any of them are focused.