Bug summary

Following#29340, when a colorbar is added in an inset axes there is still a small mismatch between the frame and the colours of the colorbar, as shown in thetest image added at #29340. That test uses the toolkitsinset_axes but the problem also appears when usingAxes.inset_axes.

Code for reproduction

From#27763 (comment):

importmatplotlib.pyplotaspltimportnumpyasnpfig,axes=plt.subplots(1,1,layout='constrained')x=np.random.randint(100,size=(30,200))c=axes.imshow(x,origin='lower',cmap='Reds',aspect=1)axins1=axes.inset_axes([0.05,0.8,0.2,0.09])fig.colorbar(c,cax=axins1,orientation="horizontal")fig.savefig('test_single.pdf',bbox_inches='tight')

Actual outcome

Expected outcome

Colorbar frame should be lined up with its colours.

Additional information

To reproduce the bug we need

• Rasterized artist ininset_axes
• Saving withbbox_inches='tight'
• Saving as pdf, so perhaps linked to the mixed-mode renderer callingadjust_bbox multiple times viaprocess_figure_for_rasterizing.

Increasing the figure dpi to 300 makes the problem disappear. Also, when I originally wrote the test at#29340 I forgot to set the style. The problem did not show up with classic mode.

I have reproduced with v3.2, so probably this never worked.

Operating system

Ubuntu

Matplotlib Version

main

Matplotlib Backend

QtAgg

Python version

3.12.5

Jupyter version

n/a

Installation

git checkout