Scintilla / Bugs / #2141 "End of line" annotations

The above image does not show the feature since the image is too big so the right side is cut off.

"appended to the content of the line" sounds like it will interfere with the rendering of the document text. The design of this should address issues like visible line end modes, line end drawing, and drawing layers (such as whether the background of the annotation is drawn along with the main text background or if the entire annotation is a separate layer over the document).

Another issue is that may impact is that the drawing model on macOS (which caches screen image tiles) is different to that of windows (which just renders the visible area). If annotations are right justified to the window edge, as is done by Xcode, then there will be more image cache invalidation on macOS when horizontal scrolling.