I compute the resized windows and columns on mouseup to imitate how the Acme text editor does resizing, but the event handler which computes the resize could very well be called on mousemove if preferred. Maybe it'd be worth adding that as a customization in the library interface.
Thanks. I'm not sure how many people have three mouse buttons but it wouldn't hurt to make the buttons respond to middle-clicks the same way they do to left-clicks.
Thanks. Which browser are you using? I noticed this issue in Firefox but thought I fixed it. I've tested it using the latest versions of Chrome and Firefox and it seemed to work.
Omnino does not implement the "right-click to load" functionality of Acme, as it's meant to be a general-purpose library. However, I have implemented this functionality on my personal website and plan to open-source this code as a separate library soon. You can see it here: https://spelunca.xyz/