Fixup start/end positions through StandStill.

www/js/interpreter.ts

@@ -827,8 +827,9 @@ function moveAsLowLevelMoves({ move, nextMove, startingPos, numProgessions }: {
     case "revolving door":
       const byHand = move.parameters.hand ? Hand.Right : Hand.Left;
       // TODO More parts? Or define an animation kind?
+      const waitBeats = 2;
       const carryBeats = move.beats / 2;
-      const returnBeats = move.beats - carryBeats;
+      const returnBeats = move.beats - carryBeats - waitBeats;
       return handleCirclePairedMove(move.parameters.whom, ({ id, startPos }) => {
         const isCarried = findPairOpposite(move.parameters.who, id) === null;
 
@@ -836,6 +837,11 @@ function moveAsLowLevelMoves({ move, nextMove, startingPos, numProgessions }: {
         if (isCarried) {
           const endWhich = startPos.which.swapDiagonal();
           return combine([
+            prevEnd => ({
+              beats: waitBeats,
+              endPosition: prevEnd,
+              movementPattern: { kind: SemanticAnimationKind.StandStill },
+            }),
             {
               beats: carryBeats,
               endPosition: {
@@ -855,7 +861,7 @@ function moveAsLowLevelMoves({ move, nextMove, startingPos, numProgessions }: {
               beats: returnBeats,
               endPosition: prevEnd,
               movementPattern: { kind: SemanticAnimationKind.StandStill },
-            })
+            }),
           ], startPos);
         } else {
           return combine([
@@ -1915,6 +1921,12 @@ function danceAsLowLevelMoves(moves: Move[], startingPos: Map<DancerIdentity, Se
         if (!lowLevelMoves[i].endPosition) throw "endPosition is undefined";
         lowLevelMoves[i].endPosition = lowLevelMoves[i + 1].startPosition;
         if (!lowLevelMoves[i].endPosition) throw "endPosition is undefined now";
+        if (lowLevelMoves[i].movementPattern.kind === SemanticAnimationKind.StandStill) {
+          lowLevelMoves[i].startPosition = lowLevelMoves[i].endPosition;
+          if (i > 0) {
+            lowLevelMoves[i - 1].endPosition = lowLevelMoves[i].startPosition;
+          }
+        }
       }
       // If progression isn't detected properly, do nothing.
       if (progressionInSets === 0) {