improve X-Ray when targeting above [bounty: 15 XTR]

[DreadKnight]

When moving medium and large units, hovering a location within the movement path that's located on the rows above the location of the unit should trigger X-Ray if the second or third hexagons of the unit are not visible. I've attached a scenario that should trigger, as this might be helpful in avoiding any possible traps.

[DreadKnight]

This should probably also trigger when targeting (area) abilities, like for example Abolished's Wild Fire.