Bug report

Bug summary

tk window (whether tkagg or mplcairo.tk) immediately resizes down to zero-height upon showing up.

Code for reproduction

$ MPLBACKEND=tkagg python -c "from pylab import *; plot(); show()"

Actual outcome

As described above.

Expected outcome

Window stays at original size.

Matplotlib version

• Operating system: arch linux
• Matplotlib version: master
• Matplotlib backend (print(matplotlib.get_backend())): tkany
• Python version: 38
• Jupyter version (if applicable):
• Other libraries:

This bisects to #16828 (attn @QuLogic), even though it's not clear how that's related... perhaps the dynamic changes to figure dpi confuse tk, but it's not clear why this is different from before?