Cppcheck reports "Logical disjunction always evaluates to true" in sdext module

Hello,

Cppcheck reports this in sdext module :
[source/minimizer/optimizerdialog.cxx:276]: (warning) Logical disjunction
always evaluates to true: nNewStep >= 0 || nNewStep <= 4
Here is the line :
if ( ( nNewStep != mnCurrentStep ) && ( ( nNewStep <= MAX_STEP ) || (
nNewStep >= 0 ) ) )

Shouldn't it be :
if ( ( nNewStep != mnCurrentStep ) && ( nNewStep <= MAX_STEP ) && ( nNewStep
> = 0 ) )
?
Moreover, if I'm right, should we additionnally throw an exception (which
one ?) if "nNewStep" is not between 0 and MAX_STEP 

If ok for just the condition change, I can commit and push on master (what
about 3.5 ?)
About the exception, I don't know what to put.

Julien.

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