timeline: behavior cursor line
The behavior of the cursor line is not intuitive!
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Once set, the cursor line should not disappear if the user chooses to display another property (go from temperature to density, for example)
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Once the cursor line has been set, one cannot click on another part of the plot to display that profile. Double click moves the cursor line though but without action on the simplified profile. Time line has to be 'animated' again to allow for a change to happen.