Gave Affinity Designer a shot and I'm very impressed! Had a quick Love Letter in minutes. @MacAffinitypic.twitter.com/xFo1RNFEpt
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This was the first thing I tried, but even after turning sync on again no changes to the "original" symbol are applying.
I take that back. Just added some other shapes to the symbol and they do appear on both. Font and size are independent now.
Yeah, that's how it should work – googling this I found someone saying it may be changed at some point, where font/size isn't desynched, too
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