Hi, I've modified the plugin to enable an optional proportional scaling of the cover.

There are two buttons to set an entry to scale "proportional" or "non proportional". The default setting is "non proportional". In proportional mode the cover will be scaled that the width and height will be at least the defined sizes.

The saved config should be compatible with the original plugin, so you could switch the plugins easily.

Since I have no experience with Python I've copy and pasted the code as good as I could

Any response, expecially if there are any problems would be appreciated.