Bug summary

I'm not sure whether this is really a bug or I'm just using an inconsistent combination of options. Under some specific circumstances (see below) compressed layout is not applied the second time a figure is saved.

Code for reproduction

importmatplotlibimportmatplotlib.pyplotaspltimportnumpyasnparr=np.arange(100).reshape((10,10))matplotlib.rcParams['figure.constrained_layout.use']=Truefig,ax_dict=plt.subplot_mosaic('AB;AC',figsize=(6,9),width_ratios=[3,2],layout='compressed')forkeyin ["B","C"]:ax_dict[key].imshow(arr)fig.savefig("test1.png",bbox_inches="tight")fig.savefig("test2.png",bbox_inches="tight")

Actual outcome

test1.png

test2.png

Expected outcome

Both images should look like the first.

Additional information

If I do not set thercParams, all is well. If I do not setbbox_inches="tight" in my calls tosavefig, the images are identical (but I have too much white space top and bottom). Maybe there is a better option thanbbox_inches="tight" when using compressed layout?

For context, my real example is a script that makes several figures. For most of them I want constrained layout, so I set that once in thercParams for convenience. Only one figure needs "compressed", and I am saving twice because I want both a png and a pdf. Fixed it in my current example by just reverting thercParams setting for the one figure.

Operating system

RHEL7

Matplotlib Version

3.6.2 and main

Matplotlib Backend

QtAgg

Python version

3.9 and 3.11

Jupyter version

No response

Installation

conda