Update: findtarget supports selectionKey.

[zhe-he]

Previously, if the element found by findtarget was activeSelection, it would not continue searching. A new feature has been added: by pressing the Shift key, it can now continue to search for elements covered by activeSelection, enabling support for mouse:out and mouse:over events.

#10337

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[asturur]

Does this works 100% of the time? this._objects includes the object in the active selection i assume.

[zhe-he]

1.    else if (
        aObjects.length > 1 &&
        // check pointer is over active selection and possibly perform `subTargetCheck`
        this.searchPossibleTargets([activeObject], pointer)
      ) {
        // If you hold down selection key, you can select elements that are blocked by active selection.
        if (this._isSelectionKeyPressed(e)) {
          const other = this.searchPossibleTargets(this._objects, pointer);
          if (
            other &&
 2.           !(activeObject as ActiveSelection).contains(other, true)
          ) {
            return other;
          }
        }
        // active selection does not select sub targets like normal groups
3.        return activeObject;
      } 

This is the full text.
At point 1, it can be confirmed that it is definitely the activeSelection.
At point 2, if we assume that this._objects includes the activeSelection and other is the activeSelection, the result returned will be the same as at point 3.

[asturur]

I'll try to reproduce on canvas the case i think may fail