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This method was needed as a workaround for some old version of Firefox that had an issue with rendering images.
The flush of the headers caused problems with proper buffering of the response, e.g. when the response needs to be compressed.
org.apache.wicket.markup.html.IPackageResourceGuard#accept(String) now without scope parameter
The scope parameter was no longer used already, so it is now removed from the method signature.
All IXyzSettings are removed WICKET-5410
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