Changing the plotregion margin in a scheme

[Pablo Derbez]

Greetings!
I am using Stata 18 on Windows. I'm trying to write a scheme in which the top plotregion margin is set to 0. Looking through the documentation, in help scheme graph twoway, it indicates that the plotregion margin for twoway graphs can be specified with:

margin plotregion marginstyle

Where marginstyle can be specified in many ways, for instance "zero" sets all margins to 0 and "t=0" sets the top margin to 0. However, this doesn't seem to work for me. I include a MWE below:

test.scheme

  
    #include s2color
    color background  blue
    margin  plotregion  t=0

I then save the scheme and try to test it as follows:

clear all

set scheme test

sysuse auto

twoway scatter mpg price

twoway scatter mpg price, plotregion(margin(t=0))

The first twoway graph does reflect the change in background color but not the change in the plotregion margin:

And only when manually entering the option plotregion(margin(t=0)) does it work:

I have also tried using other specifications for marginstyle to test if that was the problem, but to no avail. I tried using margin plotregion 0, margin plotregion zero and margin plotregion 0 0 0 0, but none work.

Thanks for the help.