[Groff] More test cases for MM margin setting bugs

[James J. Ramsey]

The following file should add 2 inches to the top
margin. It does in Groff 1.18.

testsettopmarginiint-register.mm:

.nr pg*top-margin 2i
.PH 'Foo'Bar'Bar'
.PF 'Tom'Dick'Harry'
.P
This is a test
.P
This is a test
.P
This is a test.
.P
Extra header size is \n[pg*extra-header-size]
.P
Extra footer size is \n[pg*extra-footer-size]

The following file should also add 2 inches to the top
margin. It does in Groff 1.18.

testsetextra-header-size-register.mm:

.nr pg*extra-header-size 2i
.PH 'Foo'Bar'Bar'
.PF 'Tom'Dick'Harry'
.P
This is a test
.P
This is a test
.P
This is a test.
.P
Extra header size is \n[pg*extra-header-size]
.P
Extra footer size is \n[pg*extra-footer-size]

The following file should also add 2 inches to the top
margin. However, it does not, and in addition, it
changes the header--an unexpected side effect!

.VM 2i
.PH 'Foo'Bar'Bar'
.PF 'Tom'Dick'Harry'
.P
This is a test
.P
This is a test
.P
This is a test.
.P
Extra header size is \n[pg*extra-header-size]
.P
Extra footer size is \n[pg*extra-footer-size]


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