Keyboard input corrupted when scrolling in python on a macintosh

[dj-on-github]

scrolltest.txt
I found my termbox based program was quitting when scrolling with the touchpad on a macbook.
I traced this to the program receiving ESCs while scrolling, when it should only be getting arrow up or down events.

I wrote a test case that gets counts the events.
Run it, scroll up a few times, then press X to quit and print the results.
Without a time delay in the loop, this works fine. You only get up arrow events.
I added a time delay in the loop to simulate the delay in updating the view in my program. Then 3 other different events are received, including ESC.

Without delay..
$ ./scrolltest.py
(1, None, 65516, 0, 0, 0, 0, 0) : 14

With delay..
./scrolltest.py
(1, u'O', 0, 0, 0, 0, 0, 0) : 1
(1, u'B', 0, 0, 0, 0, 0, 0) : 1
(1, None, 65516, 0, 0, 0, 0, 0) : 104
(1, None, 27, 0, 0, 0, 0, 0) : 1

So something is up with the event handling. It seems to be chopping up the escape sequences into smaller chunks before they are interpreted as key strokes.

scrolltest.py...

[nsf]

Yeah, sadly it's a known fact on osx: nsf/termbox-go#132. Not sure what to do about it.

[rationull]

The linked termbox-go issue was resolved by adding a short wait when an incomplete escape sequence is encountered. The Escape keypress event is only emitted If the wait elapses before any more characters are encountered.