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<canvas id="foo">element with a
<div>one, and adds another (absolutely positioned) canvas element on top of existing canvas (the one with id="foo"). This only happens for dynamic canvases (
fabric.Canvas), not static ones (
fabric.StaticCanvas). Also see How fabric canvas layering works.
When object coordinates/boundaries don't match those detected by selection, you might need to call
object.setCoords(). This recalculates object's coordinates used to detect its controls.
When mouse-based group selection has incorrect offset on canvas, you can fix it via
canvas.calcOffset(). This usually happens when canvas position in a document is changed after canvas is initialized (e.g. if there was an image before that was loaded).
When approaching fabric version 1.7.0 and up you should read this short description of how object caching works: Object Caching