GBrowse2: h_feat doesn't highlight features in gbrowse_img when feature name has a dash

[doughowe]

We have a morpholino track in ZFIN. Morpholinos are named with a dash in the name like MO1-pax2a. I can fetch an image from gbrowse2 for such a feature, but I can't get the h_feat highlighting to produce any highlight when there is a dash in the feature name.

Expectation: h_feat would highlight features even if they have a dash in the feature name.

[paaatrick]

For what it's worth, we've actually discovered that the h_feat parameter apparently needs to be lowercase. So h_feat=MO1-pax2a will not produce a highlight, but h_feat=mo1-pax2a will. The feature's name in the GFF3 file has a capital MO.

I think this might be a duplicate of of #18.