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Mu still isn't so optimized that I can be profligate with spare cycles.
Instead we'll follow termbox-go's example and create a new API routine
called tb_sync() (after discussion with termbox's author). Now we only
need use tb_sync() on ctrl-l. For everything else use the optimized
render.
Now I think I've eradicated all signs of "cursor thrashing" during
refresh, in spite of how slow mu is as an interpreted language. We only
render the whole screen in some situations, and only if there's no more
input, and even then we only refresh the parts of the screen that
changed.
Thanks Jack and Caleb Couch for providing the impetus behind commits
2109-2113.
I've been lazy about writing tests for all this, but it's still good to
know I could, if I wanted to.
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It took me a long time to fix termbox because the escape codes it was
seeing seemed all wrong. Had to stop calling tb_shutdown/printf and put
in the extra 3 lines to log to a file. Then everything cleared up.
Weird.
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The trick is to check for more events and not bother rendering if so.
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CRLF still shows as two newlines, though. Cross that bridge when we get
to it.
The new chessboard test is still hanging, though.
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I've tried to update the Readme, but there are at least a couple of issues.
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