[issue36468] Treeview: wrong color change

[Terry J. Reedy]

Terry J. Reedy <tjreedy at udel.edu> added the comment:

I verified that problem continues on Windows with 3.8 and 3.9 alpha (with tk 8.6.9 -- might get updated later) and that fix posted by Matthew works.  I am testing because of #39636.

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nosy: +terry.reedy
versions: +Python 3.8, Python 3.9

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<https://bugs.python.org/issue36468>
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