Grid-referenced components

[alexcjohnson]

You can use layout.grid to position subplots, it would be nice if you could position annotations, shapes, images, and other items like colorbars and sliders, with reference to grid cells as well. Perhaps something like:

xref: 'grid',
column: 2,
x: 0.8

would mark a location 80% of the way across column 2 of the grid.

Came to mind as it would help with situations like #2915

[gvwilson]

Hi - this issue has been sitting for a while, so as part of our effort to tidy up our public repositories I'm going to close it. If it's still a concern, we'd be grateful if you could open a new issue (with a short reproducible example if appropriate) so that we can add it to our stack. Cheers - @gvwilson