bpo-35728: Add root parameter to tkinter.font.nametofont()

[desmondcheongzx]

Add a root parameter to tkinter.font.nametofont() so that the function can be called even when default root is disabled.
https://bugs.python.org/issue35728

https://bugs.python.org/issue35728

[serhiy-storchaka]

LGTM.

[terryjreedy]

The function is not terribly useful, but now is consistent with other functions. Tests look good. Thanks..

[Fidget-Spinner]

Seems to be missing a space here, indentation in rST is 3 spaces. On some versions of sphinx this causes visual differences.

Suggested change

	.. versionchanged:: 3.10
	.. versionchanged:: 3.10
	Added the *root* keyword argument.

Other than that, LGTM :).

[desmondcheongzx]

Thanks for catching that! I've updated the documentation accordingly

[terryjreedy]

Both Travis and Pipelines failed the doc check of the news item, which I believe is unchanged from the previous run that passed. I don't understand the complaint or know if the test was changed. I restarted Travis and now it passes. Maybe the transient failure was in github. I don't see any way to rerun Pipelines, but since it is the same test, and it passes before, I would consider ignoring it.

python3 tools/rstlint.py ../Misc/NEWS.d/next/
[2] ../Misc/NEWS.d/next/Library/2020-12-23-19-43-06.[bpo-42727](https://bugs.python.org/issue42727).WH3ODh.rst:1: default role used
[2] ../Misc/NEWS.d/next/Library/2020-12-23-19-43-06.[bpo-42727](https://bugs.python.org/issue42727).WH3ODh.rst:2: default role used
2 problems with severity 2 found.
Makefile:204: recipe for target 'check' failed

[Fidget-Spinner]

Both Travis and Pipelines failed the doc check of the news item, which I believe is unchanged from the previous run that passed. I don't understand the complaint or know if the test was changed. I restarted Travis and now it passes. Maybe the transient failure was in github. I don't see any way to rerun Pipelines, but since it is the same test, and it passes before, I would consider ignoring it.

The error means that another news item in another bpo used single backticks rather than double backticks for styling code. The news item was recently fixed in 8badade. Pulling in the latest changes from master into this PR will fix it.

[terryjreedy]

I just saw the checkin of #23932 which changed the news entry for #23917, which at least once had the exact same failure, by doubling the backticks. Perhaps that is needed here also.
@gpshead Please comment.

[terryjreedy]

Messages crossed. @desmondcheongzx please do the update with fetch and merge (or simple pull) rather than with 'force' argument, as some mistakenly do. It is too easy to mess up PR with the latter.

[desmondcheongzx]

Got it, I've made the appropriate update.

[serhiy-storchaka]

Thank you for your contribution @desmondcheongzx!

[desmondcheongzx]

Thank you for the reviews!