Hello, I decided to put the patch here since it is so small.
It is rather trivial, just adds a bunch of virtual markers and some methods with empty implementations, as to make them optional. I think the behavior looks ok for me, if the sub-class doesn't implement the method, no operation is performed. If some methods can be implemented based on other ones, great, but this should be a separate commit. Later Lazarus would need to be adapted, maybe now with ifdefs or else after fpc 3.0 gets released. -- Felipe Monteiro de Carvalho
virtualfpcanvas.diff
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