... Edit: Oh this: https://news.ycombinator.com/item?id=25671086
One can delete-left, by starting swiping from the delete button
That's me pasting your comment into a reply box and then using my iPhone 8 to move the cursor around. Once I start moving the cursor all I'm doing is moving it, nothing else. You can see that it starts selecting text randomly twice. It actually took me longer to trigger it this time than usual.
I think it happens when I moved to the top of the text and then make a downward motion. It's really, really annoying on a regular basis.
Will check out OpenBoard, because this sounds like a great feature.
On lineageos there's an option somewhere in the system settings to make the volume buttons move t andhe cursor when the keyboard is open.