Avalonia/src/Avalonia.Base/Media/TextFormatting/WrappingTextLineBreak.cs

using System.Collections.Generic;
using System.Diagnostics;

namespace Avalonia.Media.TextFormatting
{
    /// <summary>Represents a line break that occurred due to wrapping.</summary>
    internal sealed class WrappingTextLineBreak : TextLineBreak
    {
        private List<TextRun>? _remainingRuns;

        public WrappingTextLineBreak(TextEndOfLine? textEndOfLine, FlowDirection flowDirection,
            List<TextRun> remainingRuns)
            : base(textEndOfLine, flowDirection, isSplit: true)
        {
            Debug.Assert(remainingRuns.Count > 0);
            _remainingRuns = remainingRuns;
        }

        /// <summary>
        /// Gets the remaining runs from this line break, and clears them from this line break.
        /// </summary>
        /// <returns>A list of text runs.</returns>
        public List<TextRun>? AcquireRemainingRuns()
        {
            var remainingRuns = _remainingRuns;
            _remainingRuns = null;
            return remainingRuns;
        }
    }
}