Fix for check 409 (#349)

Author: camaelon

constraintlayout/core/src/main/java/androidx/constraintlayout/core/widgets/Chain.java

@@ -152,6 +152,9 @@ static void applyChainConstraints(ConstraintWidgetContainer container, LinearSys
                 if (isSpreadOnly && !isChainPacked) {
                     strength = SolverVariable.STRENGTH_EQUALITY;
                 }
+                if (widget == firstVisibleWidget && isChainPacked && widget.isInBarrier(orientation)) {
+                    strength = SolverVariable.STRENGTH_EQUALITY;
+                }
                 system.addEquality(begin.mSolverVariable, begin.mTarget.mSolverVariable, margin,
                     strength);
             }

constraintlayout/core/src/main/java/androidx/constraintlayout/core/widgets/ConstraintWidget.java

@@ -369,6 +369,10 @@ protected void setInBarrier(int orientation, boolean value) {
         mIsInBarrier[orientation] = value;
     }
 
+    public boolean isInBarrier(int orientation) {
+        return mIsInBarrier[orientation];
+    }
+
     public void setMeasureRequested(boolean measureRequested) {
         mMeasureRequested = measureRequested;
     }

desktop/ValidationTool/references/check_409_MATCH_MATCH.json

@@ -1,43 +1,43 @@
 {
-  "duration": "590500",
+  "duration": "197500",
   "layout": {
     "children": [
       {
         "bounds": {
           "top": "0",
-          "left": "1080",
+          "left": "225",
           "bottom": "0",
-          "right": "1080"
+          "right": "225"
         },
         "id": "barrierStart",
         "class": "Barrier"
       },
       {
         "bounds": {
           "top": "0",
-          "left": "0",
+          "left": "855",
           "bottom": "0",
-          "right": "0"
+          "right": "855"
         },
         "id": "barrierEnd",
         "class": "Barrier"
       },
       {
         "bounds": {
           "top": "0",
-          "left": "1080",
+          "left": "225",
           "bottom": "120",
-          "right": "1260"
+          "right": "405"
         },
         "id": "view1",
         "class": "MaterialTextView"
       },
       {
         "bounds": {
           "top": "0",
-          "left": "0",
+          "left": "405",
           "bottom": "120",
-          "right": "0"
+          "right": "855"
         },
         "id": "view2",
         "class": "MaterialTextView"

desktop/ValidationTool/references/check_409_MATCH_WRAP.json

@@ -1,43 +1,43 @@
 {
-  "duration": "445500",
+  "duration": "193500",
   "layout": {
     "children": [
       {
         "bounds": {
           "top": "0",
-          "left": "1080",
+          "left": "225",
           "bottom": "0",
-          "right": "1080"
+          "right": "225"
         },
         "id": "barrierStart",
         "class": "Barrier"
       },
       {
         "bounds": {
           "top": "0",
-          "left": "0",
+          "left": "855",
           "bottom": "0",
-          "right": "0"
+          "right": "855"
         },
         "id": "barrierEnd",
         "class": "Barrier"
       },
       {
         "bounds": {
           "top": "0",
-          "left": "1080",
+          "left": "225",
           "bottom": "120",
-          "right": "1260"
+          "right": "405"
         },
         "id": "view1",
         "class": "MaterialTextView"
       },
       {
         "bounds": {
           "top": "0",
-          "left": "0",
+          "left": "405",
           "bottom": "120",
-          "right": "0"
+          "right": "855"
         },
         "id": "view2",
         "class": "MaterialTextView"

desktop/ValidationTool/references/check_409_WRAP_MATCH.json

@@ -1,5 +1,5 @@
 {
-  "duration": "439000",
+  "duration": "220000",
   "layout": {
     "children": [
       {

desktop/ValidationTool/references/check_409_WRAP_WRAP.json

@@ -1,5 +1,5 @@
 {
-  "duration": "554500",
+  "duration": "245500",
   "layout": {
     "children": [
       {

projects/ConstraintLayoutValidation/app/src/main/java/androidx/constraintlayout/validation/MainActivity.java

@@ -690,7 +690,7 @@ protected void onCreate(Bundle savedInstanceState) {
 //        list_view.setLayoutManager(linearLayoutManager);
 //        list_view.setAdapter(new Adapter339(getApplicationContext(), xVals));
 
-        setContentView(R.layout.check_446);
+        setContentView(R.layout.check_409);
 
         //setContentView(R.layout.check_251);
 //        setContentView(R.layout.check_024);