[FIX] avoid duplicate contrasts

[Remi-Gau]

fix #815

[codecov]

Codecov Report

Merging #816 (2112b39) into main (b029baa) will increase coverage by 0.06%.
The diff coverage is 81.89%.

@@            Coverage Diff             @@
##             main     #816      +/-   ##
==========================================
+ Coverage   78.06%   78.12%   +0.06%     
==========================================
  Files         221      227       +6     
  Lines        5816     5837      +21     
==========================================
+ Hits         4540     4560      +20     
- Misses       1276     1277       +1     

Flag	Coverage Δ
matlab	77.96% <81.89%> (-0.10%)	⬇️
octave	75.99% <81.89%> (?)

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

Impacted Files	Coverage Δ
src/subject_level/getEventSpecificationRoiGlm.m	92.42% <ø> (ø)
src/subject_level/specifyContrasts.m	77.77% <41.17%> (-11.46%)	⬇️
src/subject_level/specifySubLvlContrasts.m	85.18% <85.18%> (ø)
src/subject_level/specifyDummyContrasts.m	88.00% <88.00%> (ø)
src/bids_model/getContrastsListFromSource.m	88.88% <88.88%> (ø)
src/bids_model/checkGroupBy.m	100.00% <100.00%> (ø)
src/bids_model/getContrastsList.m	100.00% <100.00%> (+4.76%)	⬆️
src/subject_level/appendContrast.m	100.00% <100.00%> (ø)
src/subject_level/getSessionForRegressorNb.m	100.00% <100.00%> (ø)
src/subject_level/newContrast.m	100.00% <100.00%> (ø)
... and 4 more

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