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The fit bbox to layers button should always result in the bbox being the same size as the composite of all raster layers, or smaller. The issue affects layers whose size is not already a multiple of the grid size (8px or 16px depending on model).
This image triggers the issue when it is the only layer - could test with it.
Checklist
[x] The PR has a short but descriptive title, suitable for a changelog
Summary
The math used to fit the bbox to layers was a bit off and could result in a bbox that was slightly too large.
Related Issues / Discussions
Issue that prompted me to review the logic: https://discord.com/channels/1020123559063990373/1020123559831539744/1304232644338384927
QA Instructions
The fit bbox to layers button should always result in the bbox being the same size as the composite of all raster layers, or smaller. The issue affects layers whose size is not already a multiple of the grid size (8px or 16px depending on model).
This image triggers the issue when it is the only layer - could test with it.
Checklist