#1526 Investigate if 20px offset required for MacOS can be solved by using a different event field

[High Performance Coder]

As seen in ravel-widget-view.ts and similar ilk

Comment from Niels:

If I recall correctly, the javascript mouse event has multiple subtly different X and Y values to choose from, which may include one that has a more homogenous value between different operating systems... it can also matter which HTML element you interept the mouse event on...