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Would it be possible to add a feature to merge paths together? Namely, if I draw one path, I would like the ability to extend it (assuming the same widths). You already have a "merge" mode in the toolbar, but when we draw paths using the "merge" mode, they get converted to polygons.
Maybe here is a script which does what you want: it will selected paths and join them by concatenating the segments. I guess handling of end and start extensions and redundant points is missing but it may serve as a staring point: