[3.6] bpo-30993: IDLE - Improve configdialog font page and tests. (GH…#2834

terryjreedy merged 1 commit intopython:3.6python/cpython:3.6from

terryjreedy:backport-77e97ca-3.6terryjreedy/cpython:backport-77e97ca-3.6Copy head branch name to clipboard