* In a previous update in 2021 many copyright ranges were truncated
accidentally, and some files have been copy-pasted with wrong years. These
dates have been fixed based on git history and original copyright messages.
* If the overall preview widget doesn't resize but the thumbnail does because
the preview text label has changed in size, we should emit a resize event so
the thumbnail can be redrawn.
* The Qt behaviour is that if you call setMinimumSize on a widget, then
the minimumSizeHint is IGNORED. So it is impossible to say "use this
minimum size, unless the widget wants a higher minimum size".
* So instead we do this ourselves in RDLabel. Sigh.
* This prevents a feedback loop where the label resizes wider to make
room for the margins, then the margins get bigger to keep the image
centred/scaled properly, etc.
baldurk