Runechat disappears when blind if you move across z-levels

[KnigTheThrasher]

Round ID:

3928 though it does not really matter

Testmerges:

Does not matter since it happens on a local server
#728
#843
#1269
#1135
#1309
#1266
Note: this has been happening for a LONG while. I'm just documenting it.

Reproduction:

Move across z-levels when blind, get a monkey or something to scream when outside of your tiny 3x3 view. It's invisible.