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Thanks for the patch. More IDLE patches would be welcome should you want to attack something else.
Possible browser scrolling refinements:
1. Scroll by an integral number of labels. This is easy with text. For our synthesized tree, we would have to calculate the # of canvas pixels to scroll. However, if we switch to ttk.Treeview (#31552), it, like Text has a height in lines. So its yview method might scroll in line units, like text.
2. Only bind wheel event(s) used on system? Should test on 3 systems. Do all *nix other than tk for macOS use X-window buttons? Not a big deal.
3. Use bindtags to bind wheel events just once. Then unbind when shutdown? (Check if unbind elsewhere.)