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The left edge of a region on the the editor is rounded to be on a pixel. When zoomed out, the position corresponding to that pixel is not usually identical to the region's position(). We need to correct for this as best as possible, while keeping peaks aligned to pixels.
Please see the Ardour web site at https://ardour.org/ for all documentation..
For information on building ardour:
https://ardour.org/development.html