Fix tmux list-session parsing error by removing buffer_sample field from fetch_objs function

[hongwen000]

See issue #472 and issue #471

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[tony]

@hongwen000 Thank you for this contribution and the issues

There's another possibility where we can possibly keep the separator: We could change the separator from | to be something else, e.g. ␞ (see https://stackoverflow.com/a/29811033)

If you try env LIBTMUX_TMUX_FORMAT_SEPARATOR=␞, do you still get this problem? See also #475

[codecov]

Codecov Report

Merging #473 (70c1783) into master (f7233c0) will decrease coverage by 0.07%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #473      +/-   ##
==========================================
- Coverage   88.97%   88.91%   -0.07%     
==========================================
  Files          35       35              
  Lines        3484     3483       -1     
  Branches      484      484              
==========================================
- Hits         3100     3097       -3     
- Misses        276      278       +2     
  Partials      108      108              

Impacted Files	Coverage Δ
src/libtmux/neo.py	97.64% <ø> (-0.02%)	⬇️
src/libtmux/server.py	65.75% <0.00%> (-0.92%)	⬇️

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[hongwen000]

@tony Yes, this modification can also solve my problem. Changing the delimiter to a rare Unicode character is a nice idea. Although the this character existing in buffer_sample is theoretically possible, but it is almost unlikely. One "safe" solution is to call tmux list-session twice, to get buffer_sample and other fields separately. But this would increase additional complexity. In any case, I agree to change the delimiter to ␞ to solve this problem.

[tony]

@hongwen000 I am going to release #475, come back, and see if it alleives the issue for you.