Add support of baseline to constraintlayout Placeholder. When you want to set baseline constraint on a Placeholder doesn't work because it doesn't support it. With this simple extension you can solve the issue.

PlaceholderWithBaseline.kt

import android.content.Context
import android.util.AttributeSet
import androidx.constraintlayout.widget.Placeholder

// You can replace it with Placeholder when you want to set layout_constraintBaseline_toBaselineOf
class PlaceholderWithBaseline @JvmOverloads constructor(
    context: Context, attrs: AttributeSet? = null, defStyleAttr: Int = 0
) : Placeholder(context, attrs, defStyleAttr) {
    override fun getBaseline(): Int =
        content.baseline
}