[issue27196] Eliminate 'ThemeChanged' warning when running IDLE tests

[Terry J. Reedy]

Terry J. Reedy added the comment:

I closed #20567 after finishing what I intended to do 3 years ago.  I decided make this a separate issue for trying Serhiy's suggestion of updata_idletasks.  Pursuing 'no default root' is #24137.

3 other files also gave the warning, once, when run alone.  2 of the 4 'warned with the test suite in 3.5 and 3 of 4 in 3.6.  Adding root.update or root.update_idletasks to all 4 fixed all warnings I know of for both versions. It appears to be a coincidence that the warnings consistently appeared where they did.  I also added a note about this fix to README.txt.  

There is no known problem in 2.7.  I fixed 3.5 also because the warnings sometimes appear in buildbot reports, and they don't need the noise.

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assignee:  -> terry.reedy
resolution:  -> fixed
stage: needs patch -> resolved
status: open -> closed

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<http://bugs.python.org/issue27196>
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