Spacing classes determine LSB/RSB based on nodes, not on curves

[pallemannen]

When curves extend beyond nodes to the left or right, spacing classes will move LSB/RSB based on where the nodes are, disregarding the part of the glyph that is beyond the furthest node.

Glyph 1, curve extending beyond the nodes to the right:

Glyph 2, curve extending beyond the nodes to the left, where you can see the LSB/RSB being misaligned:

If both glyphs are connected through spacing classes, and I correct the misaligned bearing of glyph 2, then glyph 1 will be equally misaligned (but of course in the other direction):

Proposed fix: Spacing classes should be based on the shape of the glyph, not on the locations of the nodes.

[johanmattssonm]

I don't think i understand. I did a small test with spacing classes without extrema in the glyph and it did work as expected.

Inspelning.2025-10-25.160508.mp4

Can you send me an example font or a screencast?

[pallemannen]

Here is a video: https://www.dropbox.com/scl/fi/urkyrfjotmi2wdjnzm4m0/Screen-Recording-2025-10-25-at-18.52.10.mov?rlkey=t81alxuwmb8ntu552j6e776i9&dl=0

Here is the font: https://www.dropbox.com/scl/fi/0ll1ekgdfsp99bo4esr4v/test.bf?rlkey=y6w02od74r2xnl2b9ouq1jpbk&dl=0

(The Video cut off the top bar for some reason, but I basically created two glyphs for A and B, so the only thing I'm doing up there is switching between them.)