Default values for inset arguments

[aparsloe]

Hullo Jürgen,

I have come across an inconsistency/oversight in the treatment of inset
arguments. I have a custom inset that inserts a LaTeX command (call it
\blah) which has two optional arguments preceding the main argument. It
makes sense for the *second* optional argument to have a default value,
but not for the first (the second one determines formatting of the first
-- if there is a first). Putting

Argument 1
...
EndArgument
Argument 2
...
Requires 1
EndArgument

in the definition of the inset means inserting the second argument
automatically generates an empty square bracket placeholder for the first:

\blah[][2nd arg]{main arg}

but if the definition of the second includes the default value (",\quad"
in fact)

Argument 1
...
EndArgument
Argument 2
...
DefaultArg ",\quad"
Requires 1
EndArgument

and the inset is inserted in a document, LyX inserts the default value
for the second option but no empty square bracket pair for the first.
The source pane shows

\blah[,\quad]{main arg}

That means that if no optional argument is used (they are *optional*
after all) LaTeX is presented with the default of the second optional
argument masquerading as the first argument, causing error. I think
DefaultArg and Requires together in a definition should trigger
insertion of an empty square bracket pair for the first argument.

Of course it doesn't follow that

\blah[][,\quad]{main arg}

will have the same effect as

\blah{main arg}

which is the form of the command when no option is used in LaTeX, but
that's a separate issue.

Andrew

[Jürgen Spitzmüller]

Hullo JÃŒrgen,
I have come across an inconsistency/oversight in the treatment of inset
arguments. I have a custom inset that inserts a LaTeX command (call it
\blah) which has two optional arguments preceding the main argument. It
makes sense for the *second* optional argument to have a default value, but
not for the first (the second one determines formatting of the first -- if
there is a first).

Please file a bug report.

JÃŒrgen

[aparsloe]

Hullo JÃŒrgen,
I have come across an inconsistency/oversight in the treatment of
inset arguments. I have a custom inset that inserts a LaTeX
command (call it \blah) which has two optional arguments preceding
the main argument. It makes sense for the *second* optional
argument to have a default value, but not for the first (the
second one determines formatting of the first -- if there is a first).
Please file a bug report.
JÃŒrgen

Ticket #9128.

Andrew