So I recently updated to 3200 and THANK YOU for the awesome work, I love the new block caret setting. (For those not in the know: set
caret: solid
block_caret: true
in the settings, then augment your color scheme with a suitable <block_caret> field.) I especially like the care that went into the block caret selection mode, with half-height block caret being used to distinguish a selection of length 1 from the ordinary caret.
However, something seems to be screwed up with the latter half-height selection caret: when at the right end of a selection, I think it would be more logical for the half-height caret to protrude from the selection’s right-hand edge (visually speaking, like a file tab, only horizontally) instead of being tucked inside the selection.
Speaking for myself as a longtime user of a non-blinking block caret, I have of course internalized the fact that the character insertion point coincides with the left edge of the block caret. I think that even when the caret is at half-height marking the end of a selection, the left edge of the caret should remain the “functional edge” of the caret, by which I mean that the left edge of the half-height caret should coincide with the right-hand edge of the selection, when at the end of the selection.
The issue is particularly disorienting for me when selecting text by dragging: as things are currently set up, the place where the caret would appear if I clicked a certain place on the page is not the same as the place the half-height caret appears if I drag the cursor to the exact same place. In short, the current setup implies that the caret’s semantics are not the same in click-mode as in drag-mode 
Another small issue with the current convention is that length 1 selections appear the same whether the caret is at the start or at the end of the selection. The two cases are not visually differentiated.
UPDATE: I got no love when I posted this 12 days ago, so I edited a bit. My apologies for the spam, for those had already seen this 