Refactor: Cleaning up

[otherJL0]

• Fixed incorrectly indented return True line in by filter method in _info class methods
• Created intermediate filtered list variables for _info class methods to more explicitly define the return type
• Reduced nesting of if statements within class attached methods
• Removed redundant int casts
• Moved MutableMapping import statement from _compat to common

[codecov]

Codecov Report

Merging #362 (f937e68) into master (2db8bba) will increase coverage by 0.00%.
The diff coverage is 82.85%.

@@           Coverage Diff           @@
##           master     #362   +/-   ##
=======================================
  Coverage   87.99%   88.00%           
=======================================
  Files          15       15           
  Lines        1499     1500    +1     
=======================================
+ Hits         1319     1320    +1     
  Misses        180      180           

Impacted Files	Coverage Δ
libtmux/common.py	87.25% <63.63%> (+0.12%)	⬆️
libtmux/session.py	81.32% <88.88%> (-0.12%)	⬇️
libtmux/window.py	84.75% <88.88%> (-0.10%)	⬇️
libtmux/pane.py	82.60% <100.00%> (+0.25%)	⬆️

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[tony]

@otherJL0 Can you rebase against master?

[tony]

LGTM!

Rebased.

[tony]

@otherJL0 Live in https://github.com/tmux-python/libtmux/tree/v0.11.0b4 + https://github.com/tmux-python/tmuxp/tree/v1.10.0b6

Grab developmental release here: https://tmuxp.git-pull.com/quickstart.html#developmental-releases

[tony]

This is live in tmuxp v1.10 and libtmux and v0.11