WIP fix(): searchPossibleTargets targets value

[ShaMan123]

This code was not FF correctly, needs work

Motivation

Trying to impl a fix for the problem presented in fabricjs#9329
Being that the group rewrite made searchPossibleTargets return a sub target instead of the found taregt to allow deep selection. This surfaced an issue that the use of Canvas#targets aka subTargets is wrong and confusing.

closes fabricjs#9329

Description

Rethinking and Reconsidering subTargets

If I go by the name and from what I understand was the original intention I believe subTargets should populate the sub targets of the found target.
Parents of the found target should not be part of subTargets, that is what makes the name confusing. They should not be part mainly because it is clear that they are in the hit region or else the found target would not be found. If anyone including fabric needs the parents it is very simple to walk up the tree.

The main use in fabric of subTargets is for events. So we need to fix that.
I think it is unclear what is expected from the synthetic events.

Changes

• _searchPossibleTargets => findTargetsTraversal + added a flag to allow searching for all hits
• fix searchPossibleTargets return value to consider an case where subTargetCheck: true, interactive: false group were travesred, so returning the first hit is wrong
• dep searchPossibleTargets => findTargets
• move setting targets to findTarget because it varies on the case and is a step towards refactoring the use of Canvas#targets

Gist

The tests came from fabricjs#9333 if you wish to merge that first, conflicts should resolve to ours

In Action