Plot viewer: x-axis range is wrongly extended to the past

[hnformentin]

Describe the bug
In the plot viewer of webviz-ert, the range of x-axis is extended back when plotting the pred_ref case. We compared to ert gui and this behavior is not present there (see images).

To Reproduce
Steps to reproduce the behavior:

1. Get a copy of the data set of Drogon tutorial (tar xhf /scratch/fmu/share/drogon/course/drogon_current.tar.gz)
2. source /prog/res/komodo/stable/enable
3. cd drogon_20211115_12-12/resmod/ff/21.0.1/ert/model
4. ert gui drogon_ahm.ert
5. Select data as indicated in the image

Expected behavior
The x-axis should not be displaced to an early date because the case pred_ref is loaded.

Screenshots
Webviz-ert compared to ert gui:

[hnformentin]

By the way, why the color of the observations is different?

[valentin-krasontovitsch]

By the way, why the color of the observations is different?

you mean black in the ert gui, and red in webviz-ert?

[hnformentin]

By the way, why the color of the observations is different?

you mean black in the ert gui, and red in webviz-ert?

Yes...

[valentin-krasontovitsch]

that's a good question 😅

[hnformentin]

I noticed the difference, because red–green color blindness is the most common form, so I would avoid having both in the same plot...

[valentin-krasontovitsch]

it's a good point! i know way too little about barrier-free design (is that the right term?), and also think about it too litte.

[andreas-el]

The issue seems to be caused by a negative value (-1) present in the timestamp series. This is plotted differently in webviz and the gui plotter, where webviz allows this as a valid datapoint and the gui plotter omits drawing it.