Concat problem

[kilohsakul]

Bug in concatenation.
Buggy example with some comment is in test-integration/src/trim.cc.

[codecov]

Codecov Report

Attention: 35 lines in your changes are missing coverage. Please review.

Comparison is base (3380500) 72.94% compared to head (ffd2fd3) 72.81%.
Report is 5 commits behind head on devel.

Additional details and impacted files

@@            Coverage Diff             @@
##            devel     #347      +/-   ##
==========================================
- Coverage   72.94%   72.81%   -0.14%     
==========================================
  Files          33       33              
  Lines        4144     4212      +68     
  Branches      955      967      +12     
==========================================
+ Hits         3023     3067      +44     
- Misses        740      761      +21     
- Partials      381      384       +3     

Files	Coverage Δ
include/mata/nfa/delta.hh	90.54% <ø> (ø)
include/mata/nfa/nfa.hh	100.00% <ø> (ø)
include/mata/nfa/plumbing.hh	94.44% <100.00%> (ø)
src/nfa/inclusion.cc	90.09% <100.00%> (ø)
src/nfa/operations.cc	63.90% <100.00%> (+0.29%)	⬆️
src/strings/nfa-noodlification.cc	71.49% <66.66%> (ø)
src/nfa/delta.cc	82.71% <80.00%> (-0.08%)	⬇️
src/nfa/intersection.cc	72.64% <70.90%> (-10.43%)	⬇️

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[vhavlena]

This could be closed (fixed in #348 )

[Adda0]

We will close this PR and create a test from tests-integration/src/trim.cc to check that the error is fixed. (Do not delete the branch for now.)