IssueTracker

ConstraintLayout version: 2.1.0-alpha2

Changing the LayoutParams of a ConstraintLayout child with a left/right margin does not update the views margins.

When we set the layout params on the child (via View.setLayoutParams), androidx.constraintlayout.widget.ConstraintLayout.LayoutParams#resolveLayoutDirection is called. At the very start of this method we assign originalLeftMargin/originalRightMargin to leftMargin/rightMargin. Since the originals are 0 we reset the margin:

        @TargetApi(17)
        public void resolveLayoutDirection(int layoutDirection) {
            if (android.os.Build.VERSION.SDK_INT >= 17) {
                this.layoutDirection = layoutDirection;
                this.isRtl = 1 == layoutDirection;
            }

            this.leftMargin = this.originalLeftMargin;
            this.rightMargin = this.originalRightMargin;
            //...

I've attached a sample project. Pressing the button will crash the app due to failed assert on the margins (see MainActivity).

Reverting to ConstraintLayout 2.1.0-alpha1 fixes the problem.