Merge pull request #2293 from paulkaplan/fix-video-motion-matrix

Fix video sensing error with stale matrices

src/extensions/scratch3_video_sensing/library.js

@@ -289,6 +289,11 @@ class VideoMotion {
                 _curr: curr
             } = this;
 
+            // The public APIs for Renderer#isTouching manage keeping the matrix and
+            // silhouette up-to-date, which is needed for drawable#isTouching to work (used below)
+            drawable.updateMatrix();
+            if (drawable.skin) drawable.skin.updateSilhouette();
+
             // Restrict the region the amount and direction are built from to
             // the area of the current frame overlapped by the given drawable's
             // bounding box.

test/unit/extension_video_sensing.js

@@ -87,6 +87,8 @@ const isNearAngle = (actual, expect, optMargin = 10) => (
 // A fake scratch-render drawable that will be used by VideoMotion to restrain
 // the area considered for motion detection in VideoMotion.getLocalMotion
 const fakeDrawable = {
+    updateMatrix () {}, // no-op, since isTouching always returns true
+
     getFastBounds () {
         return {
             left: -120,