cc @serhiy-storchaka @terryjreedy @csabella

About the ubuntu test failure: it happens at cpython/Lib/idlelib/multicall.py, line 241 in __del__. Having a look at the code it appears that, for reasons unknown to me, on Ubuntu when the destructor is called functions in tk have already been gone and hence the deletecommand(funcid) raises Can't delete Tcl command. As a workaround to Ubuntu specific behaviour, and maybe future changes in the tk library itself, exception handling could be added around the deletecommand(funcid) call, avoiding exception being raised when funcid does not exists anymore. What's your opinion?

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The Travis failure is bogus as far as this issue is concerned: 1. a warning about a future docutils change, treated as an error; 2. news.gmane.io not responding. The Travis code tests (Ubuntu) passed.

@serhiy-storchaka Do you want to add tests for this? On this issue? There seem to be no existing bind tests. ('bind' only occurs, 8 times, in test_ttk.test_widgets.) It would seem that Misc._bind could also stand being tested.

I think the code is ready to merge, pending your review.

Oh, yes, such non-trivial code needs tests.