[bug #68540] function namelengthmax result update to 2048

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Follow-up Comment #2, bug #68540 (group octave):=0A=0AHere is the running r=
esult:=0A=0AThe variable assignment in the first line can be displayed norm=
ally.=0A=0AIn -v4,it get a warning with broken 0kb file=0A=0AWarning: Varia=
ble=0A'longname'=0Awas not saved. For names exceeding 19 characters use MAT=
-file version 6 or=0Alater. =0A> In tst_namemax (line 3) =0A=0AAnd the -v6 =
format can be saved.=0A=0A=0A    __________________________________________=
_____________=0A=0AReply to this item at:=0A=0A  <https://savannah.gnu.org/=
bugs/?68540>=0A=0A_______________________________________________=0AMessage=
 sent via Savannah=0Ahttps://savannah.gnu.org/=0A
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