https://learn.microsoft.com/en-us/dotnet/api/microsoft.visualstudio.text.editor.iadornmentlayer.addadornment?view=visualstudiosdk-2022
IAdornmentLayer.AddAdornment Method (Microsoft.VisualStudio.Text.Editor) | Microsoft Learn
Adds a AdornmentPositioningBehavior.TextRelative UIElement to the layer.
text editormethodmicrosoftvisualstudiolearn