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About the canvas scrolling: that's correct (and annoying!). I've added a GitHub issue that tracks this, and I'll fix it for an upcoming release.
About the linecap / linejoin hack: you no longer need the hack. capstyle and joinstyle are now context attributes, just like fill or stroke. Here's an example:
I'm calling these commands from an external file, so I'm using integers
instead of keywords -- for ex ctx.capstyle(2) to get capstyle(SQUARE).
also, I've discovered that if you resize the NodeBox windows (for
example make the code pane narrower), the scroll bars will briefly
reappear. and if you're fast enough, it is possible to grab them and
scroll the canvas. :)
thanks for all your work on NodeBox. cheers, Gustavo.