mesh handles not working?

[Daniel J Sebald]

John,

I think that mesh() in CVS isn't working correctly in terms of the handles.  It 
appears the handle from __uiobject_get_handle__.m is returning a handle value 
which is one too high so that every time mesh() is called the old surface 
remains.

There may also be another problem inside __uiobject_draw_axes__.m with surfaces 
but I can't get that far to isolate things.

Anyway, I think the problem is near lines 106 to 111, but these globals with 
lock and unlock is too much for me to follow at the moment.  Plus I probably 
wouldn't come up with a good fix.  The attached patch is simply to show where 
the problem lies.  Try the following code:

figure(1);
x = ones(3,1) * [0:2];
y = x';
z = x.*y;
mesh(x,y,z);
x = ones(21,1) * [0:20];
y = x';
z = x.*y;
mesh(x,y,z);

figure(2);
plot([0:30],-[0:30]);
plot([0:30],[0:30]);

Notice how the first lines add another number to the kids list.  The second 
doesn't.

Dan

--- /usr/local/share/octave/2.9.9+/m/plot/__uiobject_make_handle__.m    
2007-03-04 16:14:49.000000000 -0600
+++ ./__uiobject_make_handle__.m        2007-03-06 21:02:26.861920328 -0600
@@ -105,7 +105,7 @@
 
   if (nargin == 1)
     idx = __uiobject_alloc__ ();
-    h = __uiobject_get_handle__ ();
+    h = __uiobject_get_handle__ ()
     __uiobject_list__(idx).handle = h;
     __uiobject_list__(idx).object = s;
     __request_drawnow__ ();
--- /usr/local/share/octave/2.9.9+/m/plot/__uiobject_adopt__.m  2007-03-04 
16:14:47.000000000 -0600
+++ ./__uiobject_adopt__.m      2007-03-06 21:18:46.048061408 -0600
@@ -33,7 +33,7 @@
       ## Put this child at the end of the list.  If it is already in
       ## the list, move it.
       kids(kids == child) = [];
-      kids = [kids, child];
+      kids = [kids, child]
       set (parent, "children", kids);
     else
       error ("__uiobject_adopt__: expecting parent to be a handle");