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I don't really know what most beginners will expect. Perhaps an entry in the help will be enough. I would like have a better how to use summary at the top of the file anyway.
If I swish the normal cursor across the divide, it jumps from I-bar on text side to arrow on canvas side without even displaying the two-headed arrow. Checking with a magnifying glass, I have to pause the cursor in the 3 pixels wide gray shadow of the solid black line*. (The And even then, the cursor does not always switch. Since this patch does not use ttk, I will try 'showhandle=True' and see how it looks and behaves. 
The shadow is not normal for Windows divider lines. It would be better is if could be turned off. The 'sensitive' zone of about 3 (maybe 4) pixels to the right or under the line seems to be normal.