CORE-1094: Rex: Highlight box remains at the top of the page when scroll-highlighting text

[jomcarvajal]

CORE-1094

[RoyEJohnson]

I have rebased and added a couple of small commits (explained in my comments).
I'm finding that when I extend my selection forward, the instruction box moves down, but when I extend upward (by shift-clicking before the start of the selection), it does not move.
If I select by dragging so that the page auto-scrolls while dragging, the box winds up a little below the frame (since the selected text goes right to the bottom of the viewport).
Do you think you can force the box into the viewport when the selection changes?

[jomcarvajal]

I'm finding that when I extend my selection forward, the instruction box moves down, but when I extend upward (by shift-clicking before the start of the selection), it does not move.
If I select by dragging so that the page auto-scrolls while dragging, the box winds up a little below the frame (since the selected text goes right to the bottom of the viewport).
Do you think you can force the box into the viewport when the selection changes?

@RoyEJohnson I can't see what you saw. I'm able to move the box according my selection:

Screen.Recording.2026-01-09.at.9.25.58.AM.mov

Let me know if I misinterpreted your message .

PD: I fixed the the box position when showing bottom

[RoyEJohnson]

This me in Chrome. It's apparently only when the screen is too narrow to position the box outside the text.

Screen.Recording.2026-01-12.at.4.23.48.PM.mov

[RoyEJohnson]

Just one little thing.