allow bookmarked region highlights to be applied to dotplot view #5413
Description
Is your feature request related to a problem? Please describe.
Not a problem, but the idea here is to facilitate looking to see when regions independently defined on two different genomes may be located in syntenic blocks. For example, regions associated with a particular GWAS trait in two genomes may or may not be related via synteny. Thanks to @cmdcolin for work on both the GWAS plugin and #5370 to get us within striking distance of enabling a very nice comparative GWAS application! (and sorry neither @matthewwiese nor I were at PAG this year to take him up on the offer to chat about this in person...)
Describe the solution you'd like
I'm imagining that bookmarked regions on the x-axis would get vertical lines colored according to whatever highlight color was chosen for them, while regions for the y-axis would get horizontal lines. When they intersect at regions also displaying synteny, the existing functionality could be used to get a more detailed view of the correspondence in the linear synteny view.
Describe alternatives you've considered
Initially, I was thinking about trying to display the GWAS tracks along the x and y axes, but this seems like a much easier and more general solution to the basic intent.
Additional context
(sort of like that but with an additional green horizontal bar for the second region that I'm being too lazy to photoshop in...)