Hi,


I'd like to report what I think is a bug in sage.


When selecting xmin, xmax and ymin ymax in a plot, if there is a text 
element, e.g.


text(lable, midpoint(point,line_end), horizontal_alignment='left', 
vertical_alignment='top', fontsize='xx-small', color='black')


which is outside the plotting boundaries it is still displayed.


See for instance this standalone code fragment:

a = plot(x^2, (x,0,5))
b = text("hi there wonderful Sage and SMC people", (30,30), 
horizontal_alignment='left', vertical_alignment='top', fontsize='xx-small', 
color='black')
show(sum([a,b]),aspect_ratio=1, xmin=-10,xmax=40, ymin=-10, ymax=40, 
axes_labels=['$R$ pri. $\Omega$','$X$ pri. $\Omega$'], axes_labels_size=1)
show(sum([a,b]),aspect_ratio=1, xmin=-10,xmax=40, ymin=-10, ymax=20, 
axes_labels=['$R$ pri. $\Omega$','$X$ pri. $\Omega$'], axes_labels_size=1)

The expected behaviour was that text above ymax=20 would not be displayed or 
would be cut off to fit the axes.

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