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Upstream fix from SVE: MF_MVIS flag

The MVIS flag, if set on an object *without* MF_SHADOW, imparts total
invisibility. This is the intended effect on players using double Shadow
Armors.

--- a/src/strife/r_things.c

+++ b/src/strife/r_things.c

@@ -445,7 +445,17 @@

             dc_translation = translationtables - 256 + (translation >> (MF_TRANSSHIFT - 8));

         }

     }

-    else if (translation)     // villsa [STRIFE] new translation tables

+    else if(vis->mobjflags & MF_MVIS)

+    {

+        // haleyjd 20141215: [STRIFE] Objects which are *only* MF_MVIS (players

+        // using double Shadow Armors, in particular) are totally invisible. 

+        // Upstreamed after discovered in SVE. Note this causes a 

+        // vanilla-accurate glitch with Shadow Acolytes - if they die while

+        // MF_MVIS is set, A_Fall fails to remove it and their corpse will

+        // completely disappear (that's also fixed in SVE, but not here).

+        return;

+    }

+    else if(translation)     // villsa [STRIFE] new translation tables

     {

         colfunc = transcolfunc;

         dc_translation = translationtables - 256 + (translation >> (MF_TRANSSHIFT - 8));