[Octave-bug-tracker] [bug #61350] Marker Symbol 'I' and '_' not available in plot

[Rik]

Follow-up Comment #7, bug #61350 (project octave):

> Is that use of the pipe character visible to users (other than in the output
of things like "set (gcf)") or is it only internal to the code for defining
possible property values in graphics.cc?

As you noted it is used in "set (handle_to_graphics_object)".  I thought it
was also used in generating our documentation (genpropdoc.m), but it turns out
that we use the form "s = set (h)" so we get a struct back and then use
fieldnames() to find the list of properties for an object.

In tracing I got as far as graphics-props.cc.  This is C++ code and the
message I get is


libinterp/corefcn/graphics-props.cc:3083:29: warning: unknown escape sequence:
'\|'
     m_marker ("marker", mh,
"{none}|+|o|*|.|x|\||_|s|square|d|diamond|^|v|>|<|p|pentagram|h|hexagram"),


If I use "|||" to indicate a '|' between other options then '|' doesn't show
up in the possible options.  I know that somewhere there must be a routine
that parses this possible options string; I just haven't located it yet.

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