floating labels for SvgFeatureRenderer

[rbuels]

svgfeaturerenderer labels were added in #159, but now we need to make them "float" like they do in JBrowse 1.

[cmdcolin]

Random note: Floating labels on canvas may be difficult? JB1 does have floating canvas labels

[cmdcolin]

Could do the label rendering on the client side as a way of combatting the "floating labels may be difficult"

[cmdcolin]

Any reason why this was closed? It is still an issue

[cmdcolin]

I think we do need some solution for floating or always-visible feature labels so I'm re-opening this

[cmdcolin]

Note that a very compact view of features a la UCSC can be quite nice

[cmdcolin]

Note that we had discussed that perhaps SvgFeatureRenderer in particular might be revamped into a canvas/svg type thing so maybe not specifically targetting SVG. Attempts at this should maybe be discussed

[elliothershberg]

I think this feature would definitely make the nexstrain demo #1616 more compelling if we have implemented this feature.

[rbuels]

We probably will want to make the label moving something that only happens on the main thread, without doing a full rerender. We might need to add some kind of method that renderers can call for doing partial client-side re-renders.

[cmdcolin]

The "rendering" component can be an observer react component which might give it enough access to help it fix

[rbuels]

closing in favor of doing #674 instead