[Octave-bug-tracker] [bug #53214] area.m needs update to implement ShowBaseline and other properties

[Nicholas Jankowski]

Follow-up Comment #10, bug #53214 (project octave):

in area.m, then patch.m, the axis limits are set in the call to __go_patch__
(line 176)

in plot.m, then __plt__.m, the axis limits are set in the call to __go_line__
(line 435)

both are compiled functions in  libinterp/corefcn/graphics.cc, both are passed
x-data consisting of [1:10].  so both are internally deciding to set the left
limit to 0 rather than the lowest value. As before patch hands off the job it
has set the xlim to [-1 1], it seems to be a case of resetting axes min to 0,
rather than just neglecting to update it to x_data_min. 

not set up to step through compiled functions to verify, but taking a quick
peek at graphics.cc, both call GO_BODY(patch/line).  that's where i get lost
in the 14k line file, so someone familiar will maybe need to see where it's
not setting the left xlim to be 1.   

I would suggest both plot and area get a compatibility test added such as:


## test default plot limits
%!test
%! h = plot(rand(10))
%! assert(xlim(gca),[1 10])



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