Quote:
Originally Posted by rantanplan
I did not expect that you backport it, I have (stupidly) assumed that this was intentional 
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This was me missing something in maintaining the backwards compatibility. For the moment, doing that is fairly easy, just a little annoying. For my plugins, I am intending to supporting 3.48 and 4.23 for a little longer. Version 5.44 will also be supported but doesn't need much work. My testing for the older versions of calibre will not be as thorough as for the current calibre release. And, as you can see, I will forget to test something at some point, but, if someone stuck on these older version of calibre reports the problem, I'll look at it.