underline and bar cursor-shapes don't render the character under the cursor as selected.

[leira]

The character under the cursor is always selected. It is clear with block cursor shape. I can clearly see o is part of the selection ormal:

But it is not obviously so in underline or bar cursor-shape. It doesn't seem to render the o under the cursor as selected:

I think it would be clearer if the letter o has the same background color as rmal.

[Omnikar]

This is a duplicate of #1568, which unfortunately has seemed to receive no attention in the 6 months it's been open.