Fix observer render attempt past childless sides

[arbruijn]

[roncli]

My understanding of C is entry level, but I will ask this anyway. :) Is this check happening in the right spot?

if ( (window_check || !visited[ch]) && ((wid & WID_RENDPAST_FLAG) || (observer && ch >= 0)) ) {

If ch can be less than 0 at this point, then !visited[ch] could potentially fail, even with this check.

[arbruijn]

That's right, but window_check is always 1 so I didn't bother to change it. I can add the check for visited as well if you prefer.

[roncli]

Huh. Those are really weird statements that define window_check and some others... But that's neither here nor there, I would definitely add the check just in case someone somewhere down the line wants window_check to be 0.