Merge pull request #1099 from towerofnix/scrollcompat-vm

"Implement" scroll blocks

src/blocks/scratch3_motion.js

@@ -34,7 +34,13 @@ class Scratch3MotionBlocks {
             motion_sety: this.setY,
             motion_xposition: this.getX,
             motion_yposition: this.getY,
-            motion_direction: this.getDirection
+            motion_direction: this.getDirection,
+            // Legacy no-op blocks:
+            motion_scroll_right: () => {},
+            motion_scroll_up: () => {},
+            motion_align_scene: () => {},
+            motion_xscroll: () => {},
+            motion_yscroll: () => {}
         };
     }
 

src/serialization/sb2_specmap.js

@@ -206,6 +206,45 @@ const specMap = {
         argMap: [
         ]
     },
+    'scrollRight': {
+        opcode: 'motion_scroll_right',
+        argMap: [
+            {
+                type: 'input',
+                inputOp: 'math_number',
+                inputName: 'DISTANCE'
+            }
+        ]
+    },
+    'scrollUp': {
+        opcode: 'motion_scroll_up',
+        argMap: [
+            {
+                type: 'input',
+                inputOp: 'math_number',
+                inputName: 'DISTANCE'
+            }
+        ]
+    },
+    'scrollAlign': {
+        opcode: 'motion_align_scene',
+        argMap: [
+            {
+                type: 'field',
+                fieldName: 'ALIGNMENT'
+            }
+        ]
+    },
+    'xScroll': {
+        opcode: 'motion_xscroll',
+        argMap: [
+        ]
+    },
+    'yScroll': {
+        opcode: 'motion_yscroll',
+        argMap: [
+        ]
+    },
     'say:duration:elapsed:from:': {
         opcode: 'looks_sayforsecs',
         argMap: [