python_shell: Pass __init__ keyword arguments also to _create_control

[janvonrickenbach]

Not really sure if this is the best way to do it. I would like to pass arguments to the PyShell.init function.

[codecov-io]

Codecov Report

Merging #451 into master will decrease coverage by 0.01%.
The diff coverage is 33.33%.

@@            Coverage Diff             @@
##           master     #451      +/-   ##
==========================================
- Coverage   36.63%   36.61%   -0.02%     
==========================================
  Files         481      481              
  Lines       26424    26424              
  Branches     3917     3917              
==========================================
- Hits         9680     9676       -4     
- Misses      16321    16323       +2     
- Partials      423      425       +2

Impacted Files	Coverage Δ
pyface/ui/wx/python_shell.py	25% <33.33%> (ø)	⬆️
pyface/ui/qt4/util/modal_dialog_tester.py	86.46% <0%> (-3.01%)	⬇️

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[corranwebster]

Thanks for the contribution!

As you note, this probably isn't the best way to do it; in particular the keyword args are going to be wxPython-specific and so will break compatibility with the equivalent Qt toolkit widgets; and they also conflict with the way Traits initialises objects (notice that **traits is used in the super call - that is no accident).

Which keyword arguments (ie. which features) are you particularly needing? With a little bit more work it may be possible to support them on both back-ends, probably by adding some additional Traits that reflect those particular needs.