stats display issue for open-ended rectangleGate in Cytobank

[mikejiang]

The issue is reported by @cjungR in #25 (comment)
CytoML writes the scale info for this gate in json definition

{"scale":{
"x":{"flag":4,"argument":"5","min":-5,"max":12000,"bins":256,"size":256},
"y":{"flag":4,"argument":"5","min":-5,"max":12000,"bins":256,"size":256}
}}

The label field that defines the stats position in the plot is optional and thus is currently omitted and has working fine for all close-ended gates until we encountered this gate generated by openCyto as open-ended rectangleGate to capture the cells in UR quadrant.

In ggcyto, we superseded the gate range with data range when the open-ended situation occurs, here is the code https://github.com/RGLab/ggcyto/blob/trunk/R/stat_position.R#L76-L79

The solution is either Cytobank needs to fix it or CytoML has to explicitly provide the label info in json.
However, it is not clear how the label coordinates are scaled. Here is the manual gate drawn and output from cytobank

{"scale":{
"x":{"flag":4,"argument":"5","min":-5,"max":12000,"bins":256,"size":256},
"y":{"flag":4,"argument":"5","min":-5,"max":12000,"bins":256,"size":256},
"label":[5.571834733508659,7.968586637265983]
}}

And it seems to be different from the data scale.

[tjburns08]

In trying to reproduce the issue, I am only getting NA values for statistics. This happens only when I gate on non-linear markers (eg CD33 etc). Statistics import fine with scatter. Below is an example with closed point gates.

With quad gates, statistics appear on the bottom left corner on top of each other.

Notice the plots for CD33 x CD20 appear uncompensated. I have seen this before and I have reason to believe it is a Cytobank specific bug (@katdrake you've seen this before). I'm going to have some people look at it on my end and once it's fixed I'll hopefully be able to reproduce and look into the problem with the upper right quad gate, and determine if the "bottom left corner" problem shown here is consistent.