Bug summary

NavigationToolbar2Tk._Spacer sets the spacer size to 18p and the padx to 3p, but _rescale sets them to 22p and 4p respectively.

Code for reproduction

# in ipython, tk backend
from pylab import *

plot(); show()

# In theory this should be triggered upon moving the window
# to a monitor with a different dpi, which I don't have,
# but one can also call _rescale manually
gcf().canvas.toolbar._rescale()

Actual outcome

The spacer becomes larger and with more space around it.

Expected outcome

No change to spacer size(?)

Additional information

I stumbled upon this while considering whether we could entirely get rid of _Spacer() and just add a RIDGE Frame instead and rely on _rescale() to set the size of the spacer as needed; the idea being to avoid the call to a private method in the https://matplotlib.org/stable/gallery/user_interfaces/mplcvd.html example while also not adding a new method for adding spacers.

Operating system

No response

Matplotlib Version

3.7

Matplotlib Backend

tkagg

Python version

3.11

Jupyter version

No response

Installation

git checkout