I got again an unclosable buffer with 4.3.1.
I'm not sure what cause it, but the effect was that the buffer didn't have a mode set and this caused jEdit:1900 to throw a NPE. If it is appropriate for a buffer not to have a mode set, then there should be a null check, but I guess the problem is not the missing check but the missing mode. It could be that there was an IO Error when opening the file, I'm not sure about that.
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