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If Text search is called from a variable trace then the count variable is 
not be updated.
I see this with Python 2.4.3 and Aqua Tcl/Tk 8.4.11 on MacOS X 10.4.7. 
I have not tested it elsewhere.
Note that this works fine in tcl/tk so this appears to be a Tkinter issue.
To see the problem run the attached python script.
(The script also includes the equivalent tcl/tk code in its comments, so 
you can easily test the issue directly in tcl/tk if desired.)

Same behaviour on Linux and current Python trunk.
In addition I get an IndexError, if I delete the
last character of the search string.
Does Tk allow calling search with an empty pattern?
Tkinter could handle this (with a correct result)
with the following change in Tkinter.py / Text.search():
if pattern[0] == '-': args.append('--')
->
if pattern and pattern[0] == '-': args.append('--')
Greetings,
Matthias Kievernagel

This is indeed a problem with Tkinter only, but I didn't check what is
causing it yet.
For the suggestion about fixing the search method regarding the pattern:
the fix is almost fine, but we need to disallow None as a pattern.

Nice to see someone working on this.
One thing I've checked (iirc):
You can set iVar in doSearch by hand like this:
 iVar.set(2)
 print 'iVar.get()', iVar.get()
And iVar rests at this value.
t.search does not change the value.
I don't know anything about how the tcl-interpreter
is embedded into python. I somehow had the impression
there might be a _tkinter limitation there.
Something like handling two callbacks into _tkinter
at the same time or the tcl interpreter being unresponsive
while calling a _tkinter function.
At that point I gave up. Seen nothing obvious in _tkinter/Tkinter.
Matthias Kievernagel
(mkiever/at/web/dot/de)

Fixed the issue now.
_tkinter.call needs to use the TCL_EVAL_GLOBAL flag since all the
variables in Tkinter are global variables.
Matthias: your issue about the pattern should be placed in a different
issue.

>Matthias: your issue about the pattern should be placed in a 
>different
>issue.
Done as Issue4890.
Appended a simplified copy of the demo program
and a patch there. I do not understand your remark
about None though (see new issue).
Cheers,
Matthias Kievernagel
mkiever/at/web/dot/de

The patch looks fine, please apply.
We should come up with a deprecation strategy for GlobalCall, though,
since that function is now mostly redundant.

Uhm, is it fine to remove it for good in 3.1 ? And then add a warning in
2.7 when it gets called which in turns just call Tkapp_Call ?

Commited in r69217 (r69219), r69220, r69222, r69223
Martin, I will open another ticket about GlobalCall deprecation, later
today.