Fix WebImage showing empty image when entering edit mode #20
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…rs. Now we always do a query check when hitting empty Image
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This fix #19
Maybe the main reason is that SwiftUI internal trick, when entering edit mode, it will recreate your
View.dobytreenode, but the new createdViewstruct does not trigger aonAppearmethod call. I don't think it's a designed behavior, I'll send a bugreport to Apple later.But currentlly, we can do a better way to handle possible future cases like this. We query the image url once we can not load the image, SDWebImage Core will handle the duplicated loading call, it's OK on performance.