Inline Responsive Style Needs Class Name on <picture> or <img> elements to allow caption filter to inherit required classes

Background
I'm using inline responsive images in the editor for a project. It works great but I'm forced to style my CSS based on the data-responsive-image-style attribute. We're making styles like "Content 25% width" "Content 50% width" which scale the width of the images to the container, and are used in conjunction with "align-left / align-right" to allow text to float around the image.

Problem - Using this with Captions Input Filter
Styling data attributes in css is fine and it works, but as soon as we add captions to the same images the "align-left / align-right" class attributed are passed from the image to the wrapper created by the caption filter module. This results in...

<figure class="align-left" > 
<img data-responsive-image-style="content_25_width_" srcset="..." /> 
<fig-caption> Caption Here </fig-caption>
</figure>

I can't float the container and resize the width of it without the image style class applied to the wrapper.

Solution
I've created a patch to add the responsive_image_style to the attributes['classes] array of FilterResponsiveImageStyle.php . The caption filter reads all the classes of the image and moved them to the figure wrapper.

For Consideration
I haven't had the time to review how the non-responsive image filter works. It's likely the same problem will happen with captions there. Also the machine name for image filters might not be the best option, but it's css-safe so it's a whole lot better than nothing.

Parent Issue in Core
If people think this is a good feature, and something like it isn't already in core, we should figure out how to get in the core cue.