Don't restart the legs animation from the beginning in the same state

This prevent walking silently by switching weapons indefinitely

code/fgame/player.cpp

@@ -5530,7 +5530,23 @@ void Player::EvaluateState(State *forceTorso, State *forceLegs)
                     StopPartAnimating(legs);
                     animdone_Legs = true;
                 } else if (legsAnim != "") {
-                    SetPartAnim(legsAnim, legs);
+                    float oldTime;
+                    
+                    if (currentState_Legs == laststate_Legs) {
+                        //
+                        // Added in OPM
+                        //  This allows different animations in the same state
+                        //  to be continued at the same moment.
+                        //  This is used to avoid "ghost walking" where the player
+                        //  would switch weapons indefinitely to avoid footstep sounds
+                        //
+
+                        oldTime = GetTime(m_iPartSlot[legs]);
+                        SetPartAnim(legsAnim, legs);
+                        SetTime(m_iPartSlot[legs], oldTime);
+                    } else {
+                        SetPartAnim(legsAnim, legs);
+                    }
                 }
             } else {
                 currentState_Legs = laststate_Legs;