Strange Hammer "bug"

[Botervloot]

(I'm not sure if this is a bug or just a button that I switched on by accident)

(sidestory)
I was happily mapping for L4D2 using the Left 4 Dead 2 Authoring tools, without a worry. I closed it down, and starting playing another game besides anything Source based. After I while, I grew bored and continued mapping using the L4D2 AT. Though, something was wrong, and, very annoying:

(problem)
I tried to select a brush in the 3D camera zone. It worked just like it should. But then this happened; when I tried to select another brush, it didn't select that brush, but chose the brush/object/thing behind it, ignoring the brush I actually wanted to highlight/use. If however, nothing is behind the object, it chooses it the correct way.

An illustration:

How do I fix this problem? It's gone from L4D2 AT to Source SDK, and since I also map for TF2, this is relevant.

 

[PL-7764]

In Hammer, go to Tools -> Options -> 3D Views and uncheck "Reverse selection order." That ought to fix it.

 

[Botervloot]

I knew I fucked up. Thanks!

 

[Pocket]

Holy... this "bug" is literally a feature. I tried it; it literally selects the furthest object from the viewer, even if that object is behind the entire rest of the map. Why the heck would anyone want that?

 

[PL-7764]

I can't think of a reason it's there. I thought I had one, but realized there are at least two far easier ways to do what I was thinking of. Maybe keeping it in there is the only way Valve can legally distribute the SDK free with their games or something...

My guess is there's a keyboard shortcut that turns it on, and that's why it gets mistakenly activated and screws with people's minds, similar to how Shift+W turns the grid on/off. I've seen this same thing happen to people before, and the activator is so far hidden in the options menus that it would be fairly difficult to turn on by accident.

 

[tyler]

It's there because if you have a lot of things in once place you might want the one behind the one you always click.

Like if you put func_doors and func_areaportals in the same place.

But I don't use it. I just click until I get what I want because it's faster.