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Having a way to specify that the half-brackets extend upwards but not leftwards avoids all the rendering problems they were previously suffering from. And I've spotted the VT100 scan-line characters, which should be extended to the left but not upwards. Since the middle scan-line is unified with a line-drawing character, they really need to extend leftwards for symmetry, but extending scan-line 1 upwards would be a disaster. So now there are two flags, JOIN_U and JOIN_L, to specify joining in each direction. I've renamed the both-directions flag as JOIN, because it's not just specific to line-drawing any more. I might eventually want a JOIN_D to suppress hinting of the bottom edge of the character, but I need to do some testing first.
