front: fix cursor position on space time chart on mouse move

[clarani]

closes #5246

[codecov]

Codecov Report

Merging #5271 (6912013) into dev (093127c) will increase coverage by 0.03%.
Report is 5 commits behind head on dev.
The diff coverage is 0.00%.

@@             Coverage Diff              @@
##                dev    #5271      +/-   ##
============================================
+ Coverage     18.63%   18.67%   +0.03%     
  Complexity     2318     2318              
============================================
  Files           855      856       +1     
  Lines        104107   103917     -190     
  Branches       2408     2409       +1     
============================================
+ Hits          19399    19405       +6     
+ Misses        83368    83171     -197     
- Partials       1340     1341       +1     

Flag	Coverage Δ
front	7.05% <0.00%> (+0.02%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files	Coverage Δ
...ult/components/SpeedSpaceChart/SpeedSpaceChart.tsx	0.00% <ø> (ø)
...esult/components/SpaceTimeChart/SpaceTimeChart.tsx	0.00% <0.00%> (ø)
...s/trainschedule/components/Timetable/Timetable.tsx	0.00% <0.00%> (ø)
...lt/components/ChartHelpers/enableInteractivity.jsx	0.00% <0.00%> (ø)

... and 13 files with indirect coverage changes

[kmer2016]

Well done !