front: lmr validate consist on blur

[Wadjetz]

close #9374

Validate consist only after the user finishes typing.

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 81.86%. Comparing base (9badbe7) to head (11b7c4f).
Report is 1 commits behind head on dev.

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Additional details and impacted files

@@            Coverage Diff             @@
##              dev   #10793      +/-   ##
==========================================
- Coverage   81.86%   81.86%   -0.01%     
==========================================
  Files        1082     1082              
  Lines      107123   107139      +16     
  Branches      721      721              
==========================================
+ Hits        87697    87708      +11     
- Misses      19385    19390       +5     
  Partials       41       41              

Flag	Coverage Δ
editoast	74.30% <ø> (-0.02%)	⬇️
front	89.40% <100.00%> (+<0.01%)	⬆️
gateway	2.18% <ø> (ø)
osrdyne	3.28% <ø> (ø)
railjson_generator	87.50% <ø> (ø)
tests	87.87% <ø> (ø)

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