Setting the currently visible window to new coords does not work correctly in y direction

[lehnerchristian]

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• Web browser version and OS:

Steps to reproduce

1. Open a datavisyn scatterplot (e.g. in the demo folder the index.html file (I'll push a new version of this file for reproducing this issue))
2. Try to set the currently visible window (https://github.com/datavisyn/datavisyn-scatterplot/blob/develop/src/AScatterplot.ts#L684-L696), e.g. x1 = 25, x2 = 75, y1 = 25, y2 = 75 (this should be a zoom factor of 2 in the demo having the domain in x and y set to [0, 100])

Observed behavior

• In x direction the window is correctly set to [25, 75], however in y direction the window is set to [75, 125]

Expected behavior

• the window should be set to [25, 75] in both directions