[issue45436] test_tk.test_configure_type() fails with Tcl/Tk 8.6.11

[E. Paine]

E. Paine <xepaine13 at gmail.com> added the comment:

I suspect this is a bug with Tk. `-compound` accepting the empty string is not documented and the valid Ttk compound values listed in the source do not include it (https://github.com/tcltk/tk/blob/57451473/generic/ttk/ttkInit.c#L34-L37 - ignore the NULL at the end, this is required by `Tcl_GetIndexFromObjStruct`: https://github.com/tcltk/tcl/blob/e78868d6/generic/tclIndexObj.c#L187-L191). I therefore assume it must be a regression with one of the changes that was made to `Ttk_GetCompoundFromObj` between 8.6.10 and 8.6.11. I will investigate further and report it to the Tk team.

I have not fully investigated the issue with `test_configure_type` reported here and in bpo-43139, but again, the empty string is not documented as being valid.

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