front: lmr prefill consist max speed from tag

[Wadjetz]

fix #10016

Prefill consist max speed from speed limit tag

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 79.81%. Comparing base (5d127e0) to head (55139f9).
Report is 4 commits behind head on dev.

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Additional details and impacted files

@@           Coverage Diff           @@
##              dev   #10039   +/-   ##
=======================================
  Coverage   79.81%   79.81%           
=======================================
  Files        1052     1053    +1     
  Lines      105444   105482   +38     
  Branches      727      727           
=======================================
+ Hits        84155    84195   +40     
+ Misses      21247    21245    -2     
  Partials       42       42           

Flag	Coverage Δ
editoast	73.74% <ø> (+<0.01%)	⬆️
front	89.13% <100.00%> (+<0.01%)	⬆️
gateway	2.18% <ø> (ø)
osrdyne	3.28% <ø> (ø)
railjson_generator	87.50% <ø> (ø)
tests	87.00% <ø> (ø)

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[theocrsb]

Shouldn't the speed be reset when -none- is clicked?

[Wadjetz]

Shouldn't the speed be reset when -none- is clicked?

@theocrsb It resets the value if neither a traction engine nor towed rolling stock is selected. If one of these values is selected, it uses the selected value.

[SharglutDev]

Lgtm and tested, good job ! Don't forget to fixup your last commit :)