A few more suggestions on minor issues:

- Chunk up undo actions. E.g., undo shouldn't undo a bunch of typing by single letters, but instead by the whole typing episode.

- When I'm selecting big ranges of text, and I've moved the mouse to or beyond the top or bottom of the page, scroll to reveal more text and extend the selection.

- Selecting lines is funky with lines that consist of only a newline. For instance, triple-click to select a line that's part of a block, then sweep the cursor down. The selection will "stick" above the first blank line, then snap down to grab that and the first non-empty line as you sweep downward. What if I want to grab a block with its trailing whitespace and move the whole thing? I can't.

- Tiny bug: To reproduce this, cut or delete some selected text, then undo the cut. The restored text is selected, good. Now move the cursor with an arrow key: doesn't move as expected! It seems to be offsetting from the middle of the selection, instead of from the bounds. This happens if you make a selection and copy it, as well.

--ceej