Create image with fixed height and variable width?

Specifically in title and navbar, how do I place an (unknown dimensions) image that has a fixed height (the height of the navbar) but variable width (so that it doesn’t resize the navbar). fill_width resizes the navbar (to the height of the image), shrink_to_fit makes the image very small within the navbar, zoom_to_fill makes the image get cut off, and original_size acts the same as fill_width - how do I set up my properties so that it fills the height of the assigned space and expands its width dynamically?

does that mean you don’t want to preserve the aspect ratio?

Also - Have you got a clone link so it’s easier to play around with what you’re after?

I do want to preserve aspect ratio, and I didn’t think to make one, sorry
Essentially I want the image to assign its width based on its height, rather than assigning its height based on its width (as with fill_width) or scaling within its parent’s width (as with the two scaling options)