[Octave-bug-tracker] [bug #48493] Clear up "shadowed member" warnings

[Mike Miller]

Follow-up Comment #4, bug #48493 (project octave):

I did some digging. Some of these may be false positives with older versions
of gcc. GCC 5 has "fixed" the -Wshadow option by making it not warn about
variables and methods that have the same name, only class variables and local
variables or parameters.

So for example having a local variable named "parent" no longer emits a
-Wshadow warning if the class or its base class has a method also named
"parent".

Reference to GCC bug report:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=57709

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