Ned Deily <n...@acm.org> added the comment:

It looks like the problem is that the current Cocoa Tcl/Tk 8.5.x returns an 
incorrect MouseWheel event.  Using the supplied test program and breakpointing 
in PythonCmd (around Modules/_tkinter.c:2027 in default), I found that it is 
being called from Tcl for MouseWheel events with an "argc" of 20, which looks 
suspiciously like the length of argv[1], "4302153816mouse_wheel", rather than 
the number of arguments which should be more like 3.  It may also be an issue 
that affects Python because _tkinter still uses the older Tcl_CreateCommand 
interface rather than the newer Tcl_CreateObjCommand.  The same Tcl behavior is 
observed with Python 2.7 _tkinter.c but there the bogus arguments are 
translated using PyString_FromString which is unaffected by the garbage 
arguments.  It might be possible to workaround this problem in _tkinter but the 
next step is to open a Tcl/Tk issue against the Cocoa implementation and push 
for a proper fix there.

http://www.tcl.tk/man/tcl8.5/TclLib/CrtCommand.htm

----------
assignee: ronaldoussoren -> ned.deily

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<http://bugs.python.org/issue10731>
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