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I've tried to check the source code of IDLE in search of chained comparisons without parenthesis (like the example I showed and the bug with the mouse wheel). I couldn't find something important.
Then I wrote in a file the following code:
import tkinter
root = tkinter.Tk()
text = tkinter.Text(root)
vbar = tkinter.Scrollbar(root)
vbar.pack(side=tkinter.RIGHT, fill=tkinter.Y)
text.pack(side=tkinter.LEFT, fill=tkinter.BOTH)
text.config(yscrollcommand=vbar.set)
vbar.config(command=text.yview)
lines = ['This is the line number %d.\n' % i for i in range(200)]
text.insert(tkinter.END, ''.join(lines))
In both Python 3.6 and 3.7 with Tk 8.6.8 on macOS 10.13, click-and-drag on the upper half of the scrollbar slider has no effect (the slider sticks at the top), like in the bugs #1 and #3. I strongly suspect a tkinter problem, as the equivalent Tcl/Tk code functions well. Click-and-drag in the lower half of the slider functions (in my code and IDLE) for me. Can someone reproduce this?