Minor regression by me in https://git.gnome.org/browse/vte/commit/?h=vte-0-36&id=335872e (addressing bug 722635 comment 7):

Print a line that's exactly as long as the terminal's width, and is terminated by an explicit newline. Select that text with the mouse, starting from middle(ish), extending to the far right, beyond the terminal's border.

Previous/expected behavior: newline gets selected. New/actual behavior: newline doesn't get selected.

Confining the click coordinate to the visible area is necessary at some point (rewrap logic requires that selection start/end coordinates correspond to actual cells), but not at the very beginning: there we need to know about certain offscreen values as special cases.