Small domain causing hovers to not appear

[abalter]

Ok, maybe "sensible" and "nonsensical" are not really true, I'm just thinking domain should be [0,1], but maybe that is not necessary.

This bug was discovered via this SO post. http://stackoverflow.com/questions/37178664/plotly-hover-text-not-displaying/37180688#37180688

This fiddle has the following code, and hover text is not working. If I make the single change of domain from [0.85, 0.9] to [0.85, 1.9], the hovers show. But the whole point is to have the line of markers above other plots as in http://plnkr.co/edit/vvStyutowlwubUdddY37

var data =
{
    "x":["2014-02-10 00:00:00.0","2014-02-18 00:00:00.0","2014-02-24 00:00:00.0"],
  "y":[0,0,0],
  "text":["gemcitabine","gemcitabine + Abraxane","Xeloda"],
    "hoverinfo": "all",
  "name":"Treatment",
  "type":"scatter",
  "mode":"markers",
  "marker":
  {
    "size":9,
    "color":"#800000"
    },
  "uid":"c2e171"
};

var layout = 
{
    "title":"Treatments",
  "height":600,
  "width":655,
  "autosize":true,
  "yaxis":
  {
    "titlefont":
    {
        "size":12,
      "color":"#800000"
    },
    "domain":[0.85,0.9],
    "showgrid":false,
    "showline":false,
    "showticklabels":false,
    "zeroline":true,
    "type":"linear",
    "range":[0,0],
    "autorange":true
  },
  "hovermode":"closest",
  "xaxis":
  {
    "type":"date",
    "range":[1389215256994.8186,1434909143005.1814],
    "autorange":true
  }
};

Plotly.plot('graph', [data], layout);

[etpinard]

Bug confirmed. Thanks for bringing this up.

Reproducible codepen: http://codepen.io/etpinard/pen/BKEpgW

Hover labels visibility should not be affected by the axis domains.

[etpinard]

If I make the single change of domain from [0.85, 0.9] to [0.85, 1.9], the hovers show

By the way, domain values beyond [0,1] (e.g [0.85, 1.9]) are constrained to the [0,1] interval. That is, [0.85, 1.9] is really the same as [0.85, 1] for plotly.js.

[abalter]

Here are a couple of playgrounds that might help with debugging:

https://jsfiddle.net/abalter/kehgovq9/

https://jsfiddle.net/abalter/kehgovq9/

[jdugge]

I believe this happens because plot.ly wants to constrain labels strictly to the height of current y axis (pmax is basically the length of the current axis).

One way to solve this could be to allow labels to spill out of the current axis, at least into the associated x-axis, but possibly also into other subplots or even into the margins of the plot.