[csharp] Ported 0 timeScale fix, see #1194.

spine-csharp/src/AnimationState.cs

@@ -142,7 +142,7 @@ namespace Spine {
 			from.trackLast = from.nextTrackLast;
 
 			// Require mixTime > 0 to ensure the mixing from entry was applied at least once.
-			if (to.mixTime > 0 && (to.mixTime >= to.mixDuration || to.timeScale == 0)) {
+			if (to.mixTime > 0 && to.mixTime >= to.mixDuration) {
 				// Require totalAlpha == 0 to ensure mixing is complete, unless mixDuration == 0 (the transition is a single frame).
 				if (from.totalAlpha == 0 || to.mixDuration == 0) {
 					to.mixingFrom = from.mixingFrom;
@@ -153,6 +153,13 @@ namespace Spine {
 				return finished;
 			}
 
+			// If to has 0 timeScale and is not the first entry, remove the mix and apply it one more time to return to the setup pose.
+			if (to.timeScale == 0 && to.mixingTo != null) {
+				to.timeScale = 1;
+				to.mixTime = 0;
+				to.mixDuration = 0;
+			}
+
 			from.trackTime += delta * from.timeScale;
 			to.mixTime += delta * to.timeScale;
 			return false;
@@ -250,7 +257,7 @@ namespace Spine {
 				bool firstFrame = from.timelinesRotation.Count == 0;
 				if (firstFrame)	from.timelinesRotation.Resize(timelines.Count << 1); // from.timelinesRotation.setSize
 				var timelinesRotation = from.timelinesRotation.Items;
-				
+
 				from.totalAlpha = 0;
 				for (int i = 0; i < timelineCount; i++) {
 					Timeline timeline = timelinesItems[i];
@@ -507,7 +514,7 @@ namespace Spine {
 		/// for a track. If the track is empty, it is equivalent to calling <see cref="SetAnimation"/>.</summary>
 		/// <param name="delay">
 		/// delay Seconds to begin this animation after the start of the previous animation. If  &lt;= 0, uses the duration of the
-		/// previous track entry minus any mix duration plus the specified<code>delay</code>.If the previous entry is 
+		/// previous track entry minus any mix duration plus the specified<code>delay</code>.If the previous entry is
 		/// looping, its next loop completion is used instead of the duration.
 		/// </param>
 		/// <returns>A track entry to allow further customization of animation playback. References to the track entry must not be kept
@@ -897,7 +904,7 @@ namespace Spine {
 		public float MixDuration { get { return mixDuration; } set { mixDuration = value; } }
 
 		/// <summary>
-		/// Controls how properties keyed in the animation are mixed with lower tracks. Defaults to {@link MixBlend#replace}, which 
+		/// Controls how properties keyed in the animation are mixed with lower tracks. Defaults to {@link MixBlend#replace}, which
 		/// replaces the values from the lower tracks with the animation values. {@link MixBlend#add} adds the animation values to
 		/// the values from the lower tracks.
 		/// <para>
@@ -914,9 +921,9 @@ namespace Spine {
 
 		/// <summary>
 		/// If true, when mixing from the previous animation to this animation, the previous animation is applied as normal instead of being mixed out.
-		/// 
+		///
 		/// When mixing between animations that key the same property, if a lower track also keys that property then the value will briefly dip toward the lower track value during the mix. This happens because the first animation mixes from 100% to 0% while the second animation mixes from 0% to 100%. Setting HoldPrevious to true applies the first animation at 100% during the mix so the lower track value is overwritten. Such dipping does not occur on the lowest track which keys the property, only when a higher track also keys the property.
-		/// 
+		///
 		/// Snapping will occur if HoldPrevious is true and this animation does not key all the same properties as the previous animation.
 		/// </summary>
 		public bool HoldPrevious { get { return holdPrevious; } set { holdPrevious = value; } }