Fix placement issue with APC frames (#46023)
Fix placement issue with APC frames (#46023)

Placing an APC on a wall currently evaluates the area that the wall is in ; as walls often border two areas this may not be the area the user expects.  Instead if we evaluate the area of the user we'll be "inside" the target area.

Fixes surpious and inexplicable "This area already has an APC!" errors.

The fact that diagonal placement of frames is prohibited is assumed in this fix.
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