As a solution I would propose to simply patch gtk2_interface to return separator-height / 2 to the java side if wide-separators is 1. The actual drawing result will still be far away from what it should be: the whole spacing is messed up as you can see on the screenshot. However the affected java programs would at least have *some* seperators.
I will try to get a patch ready, but the jdk build process is still a complete mystery to me and takes forever and I want just libmawt.so rebuilt.
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