- Have a warning inline with yellow triangle appears on the left side.
- Move the mouse over either the triangle or the yellow underline.
- Select the text in the popup.
- Try to copy it to clipboard.
As soon as you press a key (be it either Ctrl or Shift) the popup disappears. It has a local menu with „Copy (Ctrl+C)” but immediately after right click the popup disappears, too.
I have ClangCodeModel turned on and the annotation is from there.