Track demo joins

prboom2/src/d_event.h

@@ -114,6 +114,8 @@ BT_WEAPONMASK_OLD   = (8+16+32),//e6y
   BTS_SAVEMASK    = (4+8+16),
   BTS_SAVESHIFT   = 2,
 
+  // Demo joined.
+  BT_JOIN = 64
 } buttoncode_t;
 
 

prboom2/src/g_game.c

@@ -4065,6 +4065,10 @@ void G_ReadDemoContinueTiccmd (ticcmd_t* cmd)
   {
     demo_continue_p = NULL;
     democontinue = false;
+    // Sometimes this bit is not available
+    if ((demo_compatibility && !prboom_comp[PC_ALLOW_SSG_DIRECT].state) ||
+      (cmd->buttons & BT_CHANGE) == 0)
+      cmd->buttons |= BT_JOIN;
   }
 }