ImageBrush incorrectly offset when target region (Path or Rectangle) has a negative offset.

[tocsoft]

Prerequisites

• I have written a descriptive issue title
• I have verified that I am running the latest version of ImageSharp.Drawing
• I have verified if the problem exist in both DEBUG and RELEASE mode
• I have searched open and closed issues to ensure it has not already been reported

Description

When applying a ImageBrush to a region that overlaps a negative postion the texture start drawing at the backound image edge rather than being offset.

[Theory]
[WithTestPatternImage(400, 400, PixelTypes.Rgba32)]
public void CanOffsetImage<TPixel>(TestImageProvider<TPixel> provider)
    where TPixel : unmanaged, IPixel<TPixel>
{
    byte[] data = TestFile.Create(TestImages.Png.Ducky).Bytes;
    using Image<TPixel> background = provider.GetImage();
    using Image overlay = Image.Load<Rgba32>(data);

    var brush = new ImageBrush(overlay);
    background.Mutate(c => c.Fill(brush, new RectangularPolygon(0, 0, 400, 200)));
    background.Mutate(c => c.Fill(brush, new RectangularPolygon(-100, 200, 500, 200)));

    background.DebugSave(provider, appendSourceFileOrDescription: false);
    background.CompareToReferenceOutput(provider, appendSourceFileOrDescription: false);
}

Currently produces

Should produce

this only effects negative offsets as postive ones work correctly

var brush = new ImageBrush(overlay);
background.Mutate(c => c.Fill(brush, new RectangularPolygon(0, 0, 400, 200)));
background.Mutate(c => c.Fill(brush, new RectangularPolygon(150, 200, 500, 200)));