Feature request: figures and galleries with different widths of images, but same height

[positron96]

If gallery has images of different aspect rations, it is rendered with same image widths (half or third of content width) and different heights, which does not look very pleasant:

However, Magnific popup supports aligning images by height with image-popup-vertical-fit class:

I could not make this work in minimal-mistakes because my html/css/js-fu is too weak, and _reset.css seems to prevent this with width/height override.
Would be nice to have it as a feature in theme itself.

[positron96]

I tried to use this approach:
https://css-tricks.com/adaptive-photo-layout-with-flexbox/

It needs to provide specific height, but otherwise works for me.