Object corner points in multiselection not calculated correctly

[acdvs]

Version

4.3.0

Test Cases

https://jsfiddle.net/b20puesy/
https://jsfiddle.net/24a35vtj/

Information about environment

Latest Chrome and JSFiddle

Steps to reproduce

Explained in the JSFiddles above (reproduction depends on which way the code is written).

Expected Behavior

When using Object.isOnScreen and Canvas.remove to remove objects outside the canvas bounds, objects in a multiselection should be removed when dragged outside canvas bounds.

Actual Behavior

When using Object.isOnScreen and Canvas.remove to remove objects outside the canvas bounds, objects in a multiselection will either unexpectedly disappear or not be removed at all. See test cases above.

[acdvs]

After further investigation it looks like this is a problem with the underlying coordinate calculation and not the Object.isOnScreen method itself. Updating the issue to reflect this.

[asturur]

yes object in multi selections have the 4 main corners relative to the group they are in, isOnScreen could have a slower path to take that into account

[acdvs]

Could you explain what you mean? I'm not sure I understand.

Here's another JSFiddle showing the bug. Select and move each group of objects. The left group is calculated correctly while the right group isn't.

[asturur]

i mean that object.isOnscreen should be fixed to work in the use case you are mentioning