Message 298761 - Python tracker

I am working on this.
* Change 'test_highlight_sample' to 'highlight_sample.
* Change 'set_font_sample()' to 'set_samples()', since it also changes highlight_sample, and test.
* Add gui event test for 'bold' checkbutton.
* Perhaps add gui event test for size pulldown, or wait until replace.
* Test tab setting or wait until replace.

Do this before #24776 to redo page and #13802 to redo sample