Only apply parent layer alpha to mattes (#2598)

Fixes #2570

lottie/src/main/java/com/airbnb/lottie/model/layer/BaseLayer.java

@@ -360,7 +360,7 @@ public void draw(Canvas canvas, Matrix parentMatrix, int parentAlpha, @Nullable
         }
         clearCanvas(canvas);
         //noinspection ConstantConditions
-        matteLayer.draw(canvas, parentMatrix, alpha, null);
+        matteLayer.draw(canvas, parentMatrix, parentAlpha, null);
         if (L.isTraceEnabled()) {
           L.beginSection("Layer#restoreLayer");
         }

snapshot-tests/src/main/assets/Tests/MattWithParentAlpha.json

@@ -0,0 +1 @@
+{"v":"5.12.2","fr":30,"ip":0,"op":32,"w":84,"h":84,"nm":"icon_home_bar_s","ddd":0,"assets":[],"layers":[{"ddd":0,"ind":1,"ty":4,"nm":"xin2","parent":2,"td":1,"sr":1,"ks":{"o":{"a":0,"k":100,"ix":11},"r":{"a":0,"k":0,"ix":10},"p":{"a":0,"k":[0,0,0],"ix":2,"l":2},"a":{"a":0,"k":[0,0,0],"ix":1,"l":2},"s":{"a":1,"k":[{"i":{"x":[0.833,0.833,0.833],"y":[0.833,0.833,1]},"o":{"x":[0.167,0.167,0.167],"y":[0.167,0.167,0]},"t":7,"s":[159,159,100]},{"i":{"x":[0.833,0.833,0.833],"y":[0.833,0.833,1]},"o":{"x":[0.167,0.167,0.167],"y":[0.167,0.167,0]},"t":14,"s":[90,90,100]},{"t":20,"s":[100,100,100]}],"ix":6,"l":2}},"ao":0,"shapes":[{"ty":"gr","it":[{"ind":0,"ty":"sh","ix":1,"ks":{"a":0,"k":{"i":[[2.577,0],[0,-2.577],[-2.577,0],[0,2.577]],"o":[[-2.577,0],[0,2.577],[2.577,0],[0,-2.577]],"v":[[0,-4.667],[-4.667,0],[0,4.667],[4.667,0]],"c":true},"ix":2},"nm":"Path 1","mn":"ADBE Vector Shape - Group","hd":false},{"ty":"fl","c":{"a":0,"k":[0.898039221764,0.898039221764,0.898039221764,1],"ix":4},"o":{"a":0,"k":100,"ix":5},"r":1,"bm":0,"nm":"Fill 1","mn":"ADBE Vector Graphic - Fill","hd":false},{"ty":"tr","p":{"a":0,"k":[0,0],"ix":2},"a":{"a":0,"k":[0,0],"ix":1},"s":{"a":0,"k":[300,300],"ix":3},"r":{"a":0,"k":0,"ix":6},"o":{"a":0,"k":100,"ix":7},"sk":{"a":0,"k":0,"ix":4},"sa":{"a":0,"k":0,"ix":5},"nm":"Transform"}],"nm":"Union (Stroke)","np":2,"cix":2,"bm":0,"ix":1,"mn":"ADBE Vector Group","hd":false}],"ip":0,"op":150,"st":0,"ct":1,"bm":0},{"ddd":0,"ind":2,"ty":4,"nm":"di","tt":2,"tp":1,"sr":1,"ks":{"o":{"a":1,"k":[{"i":{"x":[0.833],"y":[0.833]},"o":{"x":[0.167],"y":[0.167]},"t":7,"s":[36]},{"t":20,"s":[100]}],"ix":11},"r":{"a":0,"k":0,"ix":10},"p":{"a":0,"k":[42,42,0],"ix":2,"l":2},"a":{"a":0,"k":[0,0,0],"ix":1,"l":2},"s":{"a":1,"k":[{"i":{"x":[0.833,0.833,0.833],"y":[0.833,0.833,1]},"o":{"x":[0.167,0.167,0.167],"y":[0.167,0.167,0]},"t":0,"s":[100,100,100]},{"i":{"x":[0.833,0.833,0.833],"y":[0.833,0.833,1]},"o":{"x":[0.167,0.167,0.167],"y":[0.167,0.167,0]},"t":7,"s":[90,90,100]},{"i":{"x":[0.833,0.833,0.833],"y":[0.833,0.833,1]},"o":{"x":[0.167,0.167,0.167],"y":[0.167,0.167,0]},"t":14,"s":[102,102,100]},{"t":20,"s":[100,100,100]}],"ix":6,"l":2}},"ao":0,"shapes":[{"ty":"gr","it":[{"ind":0,"ty":"sh","ix":1,"ks":{"a":0,"k":{"i":[[6.443,0],[0,-6.443],[-6.443,0],[0,6.443]],"o":[[-6.443,0],[0,6.443],[6.443,0],[0,-6.443]],"v":[[0,-11.667],[-11.667,0],[0,11.667],[11.667,0]],"c":true},"ix":2},"nm":"Path 1","mn":"ADBE Vector Shape - Group","hd":false},{"ty":"fl","c":{"a":0,"k":[0.090196080506,0.133333340287,0.29411765933,0.360000014305],"ix":4},"o":{"a":0,"k":100,"ix":5},"r":1,"bm":0,"nm":"Fill 1","mn":"ADBE Vector Graphic - Fill","hd":false},{"ty":"tr","p":{"a":0,"k":[0,0],"ix":2},"a":{"a":0,"k":[0,0],"ix":1},"s":{"a":0,"k":[300,300],"ix":3},"r":{"a":0,"k":0,"ix":6},"o":{"a":0,"k":100,"ix":7},"sk":{"a":0,"k":0,"ix":4},"sa":{"a":0,"k":0,"ix":5},"nm":"Transform"}],"nm":"Union (Stroke)","np":2,"cix":2,"bm":0,"ix":1,"mn":"ADBE Vector Group","hd":false}],"ip":0,"op":150,"st":0,"ct":1,"bm":0}],"markers":[],"props":{}}