Cannot pick markers '+','x' or others with zero area in plots made by
pyplot.scatter

The example below 
http://old.nabble.com/file/p31305303/picker_example_scatter.py
picker_example_scatter.py  is from the matplotlib docs, but modified to use
scatter instead of plot (which works fine).
http://matplotlib.sourceforge.net/users/event_handling.html#picking-exercise

run picker_example_scatter.py
<will not respond to any picks>
edit code replace 'x' with 'o'
<Works, but only if click is inside marker - i.e. ignores picker value.>

See also
http://old.nabble.com/Can't-pick-on-various-scatter-markers-tp19140977p19140977.html
which describes the same problem.

Ububtu 10.04 LTS
matplotlib 0.99.1.1 
Python 2.6.5 (r265:79063, Apr 16 2010, 13:09:56) 


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