Steam vortices leave steam clouds behind

Code via xnethack by copperwater <aosdict@gmail.com>

doc/fixes3-7-0.txt

@@ -1249,6 +1249,7 @@ coughing due to stinking cloud wakes up nearby monsters
 stop occupation when timed levitation or choking issues a message
 use #monster to make dragon steed breathe
 wand of probing reveals tin contents
+steam vortices leave steam clouds behind
 
 
 Fixes to 3.7.0-x General Problems Exposed Via git Repository

src/mon.c

@@ -2795,6 +2795,9 @@ mondead(struct monst *mtmp)
     if (be_sad)
         You("have a sad feeling for a moment, then it passes.");
 
+    if (mtmp->data == &mons[PM_STEAM_VORTEX])
+        create_gas_cloud(mtmp->mx, mtmp->my, rn2(10) + 5, 0); /* harmless */
+
     /* dead vault guard is actually kept at coordinate <0,0> until
        his temporary corridor to/from the vault has been removed;
        need to do this after life-saving and before m_detach() */

src/monmove.c

@@ -755,6 +755,8 @@ dochug(register struct monst* mtmp)
     /* Hezrous create clouds of stench. This does not cost a move. */
     if (mtmp->data == &mons[PM_HEZROU]) /* stench */
         create_gas_cloud(mtmp->mx, mtmp->my, 1, 8);
+    else if (mtmp->data == &mons[PM_STEAM_VORTEX] && !mtmp->mcan)
+        create_gas_cloud(mtmp->mx, mtmp->my, 1, 0); /* harmless vapor */
 
     /* A killer bee may eat honey in order to turn into a queen bee,
        costing it a move. */