#4129 double blind sensor detection should only reveal a radar blip, not whole unit

[Sebastian Brocks]

http://bg.battletech.com/forums/index.php/topic,37874.msg910637.html

In double blind play, if a sensor detects a unit, the whole unit shouldn't be revealed. The player should only be notified that there's a unit at that location, not what type/tonnage/etc.

[Nicholas Walczak]

I've thought about this before, and I think the amount of work that needs to go into this should push it to be post-stable.

[Sebastian Brocks]

Further info:

1. All sensors save seismic will give you a return of the detected unit's height in levels, with elevations translating into levels on a 1-to-1 basis. It's up to the detecting player to decide if the terrain is really that high and he's detecting a ground unit, or if he's detecting something up in the air.

2. The player that controls the unit that is detected does not know that his unit has been detected.

[Nicholas Walczak]

For point 2), this is the way it currently works in MM. This was fixed in [#4068].

[Nicholas Walczak]

Fixed in [r11492].

It's mostly just client updates. I updated EntitySprite and IsometricEntitySprite to display a different icon if the Entity is an enemy unit that is only detected by sensors. It also displays "Sensor Return" as the unit name as well as the Unit tooltip.

I also made it so that the unit cannot be viewed in the UnitDisplay. This eliminates a lot of tedious work in UnitDisplay.

The icon we use for sensor returns should probably be changed. I just took the unknown_unit.gif that is used for blind drops and I changed the background to be transparent.