PR# 11316 Cannot target Editor or Context window to feature by typing its alias

The Feature name combo box for both the Editor and Context window won't accept
the alias for a feature name (and presumably won't list the alias in wildcard
popup match list when using wildcards, though I can't tell because the popup
window is all grey due to another bug).  

To reproduce: Compile with attached class.  Trying to type `prefix "@a"'
into Editor feature name combo box doesn't work, nor does `@a'.  Similarly for
`infix "@b"'.

If you show, the extended feature name in the list, it may make 
auto-completion work not very well.  If the extended feature name is
what is in the list, what happens if I type "try" and hit return.
Will it target the Editor or Context window to `try' or will it fail
to auto-complete?

Also, the user may not know the identifier name of the feature, knowing it only by its alias.
There should be some way to type in the alias in some form and see a list
of matches.  Would I have to type "*alias*" to see the features with
aliases (which would of course NOT be ordered by alias but by the identifier)?

Have you considered putting both the identifier and alias names
in the list as separate entries, even though they are really different names
for the same feature?

Although it might be confusing, the name of the feature containing an alias, e.g. try alias "@a", is actually `try'. The extended name is `try alias "@a"'. So it makes sense to only have access to `try' not `@a'. This is what the standard says.

So the question is to whether or not we should show the feature name or the extended feature name in the list.

Note that for the discussion the old `prefix' and `infix' notation should be discarded since it is obsoleted by ECMA.

Attachments for problem report #11316