Trisquel 11 update: cosmetic: buttons off screen

I had to have two tries at upgrading to Trisquel 11 and have now succeeded.

On the first go, in the main update window:

- I expanded the terminal triangle
-- the window expanded (which is correct)

- later, I found that the "Cancel" and "Update" buttons were mostly off the screen

- I contracted the terminal
-- the window did not contract (which is arguably incorrect)

- I failed to resize the window because it was not resizable

- I selected Cancel by mistake, because I could not read the writing

Please may we have either reliable contraction, or resizability.

I have no other machine to upgrade, so I cannot test fixes.

Machine: Lenovo X200; display size: 1280x800 pixels

For context, something in the chain to ~/.xsession-errors complains about the non-resizability:
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==> /home/user/.xsession-errors <==
Traceback (most recent call last):
File "/usr/lib/python3/dist-packages/DistUpgrade/ReleaseNotesViewer.py", line 145, in motion_notify_event
self.check_hovering(x, y)
File "/usr/lib/python3/dist-packages/DistUpgrade/ReleaseNotesViewer.py", line 168, in check_hovering
tags = iter.get_tags()
AttributeError: '_ResultTuple' object has no attribute 'get_tags'
Window manager warning: Window 0x2e00007 (do-release) sets an MWM hint indicating it isn't resizable, but sets min size 176 x 192 and max size 2147483647 x 2147483647; this doesn't make much sense.
Window manager warning: Window 0x2e00007 (do-release) sets an MWM hint indicating it isn't resizable, but sets min size 176 x 192 and max size 2147483647 x 2147483647; this doesn't make much sense.
/var/lib/dpkg/lock:
** Message: 14:42:13.544: PANEL_ORIENTATION_BOTTOM
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