Bug summary

In matplotlib 3.10.0, usingfill_between() withtransform=ax.get_xaxis_transform() increases the y-limits every time it is called, and the original plot gets squeezed gradually, which did not happen in previous version (3.8.0).

Code for reproduction

#Modified from https://matplotlib.org/stable/gallery/lines_bars_and_markers/fill_between_demo.htmlimportmatplotlib.pyplotaspltimportnumpyasnpfig,ax=plt.subplots()x=np.arange(0,4*np.pi,0.01)y=np.sin(x)ax.plot(x,y,color='black')threshold=0.75ax.axhline(threshold,color='green',lw=2,alpha=0.7)foriinrange(10):ax.fill_between(x+0.5*i,0,1,where=y>threshold,color='green',alpha=0.1,transform=ax.get_xaxis_transform())

Actual outcome

Expected outcome

Additional information

The expected outcome is from version 3.8.0

Operating system

Window 11

Matplotlib Version

3.10.0

Matplotlib Backend

module://matplotlib_inline.backend_inline

Python version

Python 3.12.11

Jupyter version

7.4.4

Installation

None