Fix combobox initial sizing
Summary:
We have a listview in a popup. The popup is resized to the listview
content height.
Because the popup starts out at size 0 the listview thinks it's too
small to show anything.
So it doesn't load any delegates.
As it has no delegates it can't guess the contentHeight.
contentHeight is a guess based on count * (currentHeight
/ currentlyLoadedDelegates)
That means the popup doesn't resize properly.
Ultimately it does end up showing a two entries, but it doesn't
re-evaluate the contentHeight properly to resize the popup correctly.
Forcing it to load one delegate is enough to break that cycle.
BUG: 403736
Test Plan:
Opened popup in cursortheme and fonts
Worked correctly
Reviewers: Plasma, mart, ngraham
Reviewed By: Plasma, mart, ngraham
Subscribers: plasma-devel
Tags: Plasma
Differential Revision: https://phabricator.kde.org/D18597