[Octave-bug-tracker] [bug #62373] some plot functions ignore axes handle

[Markus Mützel]

URL:
  <https://savannah.gnu.org/bugs/?62373>

                 Summary: some plot functions ignore axes handle
                 Project: GNU Octave
            Submitted by: mmuetzel
            Submitted on: Wed 27 Apr 2022 08:02:13 PM CEST
                Category: Octave Function
                Severity: 5 - Blocker
                Priority: 5 - Normal
              Item Group: Regression
                  Status: Confirmed
             Assigned to: None
         Originator Name: 
        Originator Email: 
             Open/Closed: Open
                 Release: 7.1.0
         Discussion Lock: Any
        Operating System: Any

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Details:

Re-creating a bug report for the issue reported in patch #10200 so that it can
be marked as a blocker for Octave 7.2.

The original report:
stairs ignores first arg: axes handle

H1 = subplot(2,1,1);
H2 = subplot(2,1,2);
stairs(H1, 1:5,1:5, 'b')
stairs(H2, 1:5,1:5, 'r')

both draw commands goes into last axes handle
This does not happen with plot(H, ...)


Addendum: This is a regression from bug #61945 for which `newplot` was changed
to no longer set the current axes. (I pushed those changes probably a little
to hastily.)
This does not only happen for `stairs` but for all plot functions that expect
`newplot` to change the current axes. That is most probably true for functions
that combine `newplot` with `__next_line_color__.m` and
`__next_line_style__.m` (because the latter always act on the current axes).

Functions that combine those functions and might therefore be affected are:
- area.m
- plot3.m
- stairs.m
- bar.m
- stem.m

To be save, we should probably check all functions that use `newplot` (which
are many)...

Should we revert the changes for bug #61945 and work out a proper fix for this
before reapplying them on default?





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