activeGroup removeObject (shiftKey) did not work if perPixelTargetFind = true

[Kienz]

In the following jsfiddle you can see the behavior of activeGroup with perPixelTargetFind = true (left canvas) and activeGroup with perPixelTargetFind = false (right canvas).

Select all objects and try to deselect one of the group objects with shiftKey. On the left canvas it doesn't work.
http://jsfiddle.net/Kienz/62AXX/

The problem is that absolute pointer coordinates are used for target with relative coordinates (group object). I tried to normalizePointer (_normalizePointer) => this worked only for objects with positive relative left/top parameters.

The other thing i tried is to use whole group object for check if target is transparent:
var isTransparent = this._isTargetTransparent(activeGroup && this.containsPoint(e, activeGroup) ? possibleTargets[j].group : possibleTargets[j], pointer);
https://github.com/kangax/fabric.js/blob/master/src/canvas.class.js#L749

This works but maybe there is some performance problem for large groups (all objects have to be renderd on cacheContext).

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[kangax]

@Kienz is this still happening?

[asturur]

Actually i cannot deselect in any grouped object. with shift. not with perPixelTarget, not normal.

[asturur]

@kangax @Kienz i just tested, i cannot deselect any selection created active group using shift key.
I really do not know if this is a new issue

[kangax]

@asturur @Kienz looks like a regression (it worked before)

[asturur]

9e1a93d#diff-9dc132ed9a0787568f773999ba577e2bR813

i know pointing finger is easy, it looks like is this.
i cannot make test now.

[asturur]

No restoring that line those not change situation