https://groups.google.com/a/chromium.org/d/topic/chromium-hterm/QCyBPRxq-Oc/discussion

- if viewing scrollback, the text cursor never hides, even if the mouse is moved over it

- there's a small border around the text cursor which doesn't trigger autohiding, at least on the left side

- when in mouse mode, the wheel events cause the text cursor to move, and if it moves under the mouse, it doesn't hide