Subtitle Edit: Issue #8427

using System.Diagnostics;

namespace WinFormsApp1;

public partial class Form1 : Form
{
    public Form1()
    {
        InitializeComponent();

        var button = new Button()
        {
            Text = "@",
            Width = 50, Height = 2 * 24,
        };
        button.Font = new Font("Arial", 24, FontStyle.Bold);
        Controls.Add(button);

        // var graphics = button.CreateGraphics();
        // var image = Image.FromHbitmap(graphics.GetHdc());

        _ = Task.Delay(1000 * 3).ContinueWith(_ =>
        {
            // #
            var bitmap = new Bitmap(button.Width, button.Height);
            var graphics = Graphics.FromImage(bitmap);
            var rectangle = button.RectangleToScreen(button.ClientRectangle); // client (app) => screen (monitor)
            // var rectangle2 = button.RectangleToClient(button.ClientRectangle); // screen (monitor) => client (app)
            graphics.CopyFromScreen(rectangle.Location, Point.Empty, button.Size);
            // bitmap.Save("image.bmp");
            // Process.Start("image.bmp");

            for (int i = 0; i < bitmap.Width; i++)
            {
                for (int j = 0; j < bitmap.Height; j++)
                {
                    var pixel = bitmap.GetPixel(i, j);
                    if (pixel.R == button.ForeColor.R &&
                        pixel.G == button.ForeColor.G &&
                        pixel.B == button.ForeColor.B)
                    {
                        // NOTE: TEXT HAS BEEN FOUND BUTTON - OTHER SIZE TRY ANOTHER FONT
                        Debugger.Break();
                    }
                }
            }
        }, TaskScheduler.FromCurrentSynchronizationContext());
    }
}

// https://www.youtube.com/watch?v=x-tMlZ3LTw8

// https://github.com/SubtitleEdit/subtitleedit/issues/8427