Terry J. Reedy added the comment:

The patch for #18132 replaced pack with grid, But the replacement seemed 
partial even within the top frame (but I may have misread). Mixing the two is 
known to be a bad idea. http://effbot.org/tkinterbook/grid.htm has a big 
warning box about this. I think we can fix both issues with a 2row x 4col grid. 
The first col would have a minsize as now but be expandable. The canvas would 
have a rowspan of 3. The bottom row would have a fixed size so it does not 
disappear. I don't know if gridding a frame with a widget and scrollbars packed 
inside is ok or not.  If not, it should be possible to grid widget and 
scrollbars instead. In any case, the result should be a bit simpler, with at 
least 1 less intermediate frame (for the 3 buttons under the canvas. Unless 
someone else would rather, I will do a final review, test, and commit. 

If you try an approach that does not work, say so and I will know not to 
suggest it ;-).

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assignee:  -> terry.reedy

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<http://bugs.python.org/issue21597>
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